Turn off all electronic devices
|
|
- Caroline Wilson
- 6 years ago
- Views:
Transcription
1 Radio 1 Radio 2 Observations about Radio Radio It can transmit sound long distances wirelessly It involve antennas It apparently involves electricity and magnetism Its reception depends on antenna positioning Its reception weakens with distance There are two styles of radio: AM and FM Turn off all electronic devices Radio 3 3 Questions about Radio Radio 4 Question 1 1. How can a radio wave exist? 2. How is a radio wave emitted and received? 3. How can a radio wave represent sound? Q: How can a radio wave exist? A: Electric and magnetic fields create one another. Radio waves are electromagnetic waves: structures made only of electric and magnetic fields they are emitted or received by charge or pole they are self-sustaining sustaining while traveling, even in vacuum their electric and magnetic fields recreate one another Radio 5 Electromagnetism (Version 3) Radio 6 Structure of a Radio Wave Magnetic fields are produced by magnetic poles and subatomic particles, moving electric charges, and changing electric fields. Electric fields are produced by electric charges and subatomic particles, moving magnetic poles, and changing magnetic fields. Electric field is perpendicular to magnetic field Changing electric field creates magnetic field Changing magnetic field creates electric field Polarization of the wave is associated with the wave s electric field 1
2 Radio 7 Question 2 Radio 8 A Tank Circuit Q: How is a radio wave emitted and received? A: Accelerating charge electromagnetic wave Accelerating charge causes electromagnetic wave It makes an electric field that changes with time It makes a magnetic field that changes with time and the two fields can form an electromagnetic wave Electromagnetic wave causes accelerating charge Its electric field pushes on the charge For bigger wave, slosh charge in a tank Tank circuit is a harmonic oscillator It consists of a capacitor and an inductor Charge cycles through the circuit Tank s energy alternates between magnetic field in its inductor electric field in its capacitor Tank circuit can accumulate energy Frequency set by capacitor & inductor Radio 9 An Antenna is a Tank Circuit An antenna is a straightened tank circuit! Antenna s frequency is set by its length Resonant when it is ½ radio wavelength long A conducting surface can act as half the antenna Above a conducting surface, antenna is resonant when it is ¼ wavelength long Radio 10 Emitting and Receiving Waves A transmitter uses a tank circuit to slosh charge up and down its antenna, which acts as a second tank. A receiver uses a tank circuit to detect charge sloshing on its tank-circuit antenna. Transmitter antenna charge affects receiver antenna charge Antenna orientations matter! Radio 11 Question 3 Radio 12 AM Modulation Q: How can a radio wave represent sound? A: Vary the wave to send sound information. AM or Amplitude modulation Fluctuating amplitude conveys sound information FM or Frequency modulation Fluctuating frequency conveys sound information Information can be encoded as a fluctuating amplitude of the radio wave The air pressure variations that are sound cause changes in the amount of charge moving on the antenna and thus the intensity of the wave The receiver detects these changes in radio wave intensity. 2
3 Radio 13 FM Modulation Radio 14 Summary about Radio Information can be encoded as a fluctuating frequency of the radio wave The air pressure variations that are sound cause slight shifts in the frequency of charge motion on the antenna and the frequency of the wave The receiver detects these changes in radio wave frequency. Accelerating charges cause electromagnetic waves Electromagnetic waves cause accelerating charges Those waves are only electric and magnetic fields Accelerating charge on a transmitting antenna produces a radio wave that causes charge to accelerate on a receiving antenna Radio waves can represent sound information Radio 15 Radio 16 Observations About Microwaves Microwave ovens cook food from inside out They often cook foods unevenly They don t defrost foods well You shouldn t put metal inside them?! Do they make food radioactive or toxic? Turn off all electronic devices Radio 17 4 Questions about 1. Why do microwaves cook food? 2. How does metal respond to microwaves? 3. Why do microwave ovens tend to cook unevenly 4. How does the oven create its microwaves? Radio 18 Question 1 Q: Why do microwaves cook food? A: Water in the food responds to their electric fields. Microwaves are a class of electromagnetic waves Long-wavelength EM waves: Radio & Microwave Medium-wavelength: IR, Visible, UV light Short-wavelength: X-rays & Gamma-rays Microwaves have rapidly fluctuating electric fields. 3
4 Radio 19 Water Molecules Radio 20 Microwave Heating Water molecules are unusually polar An electric field tends to orient water molecules les A fluctuating electric field causes water molecules to fluctuate in orientation Microwaves have alternating electric fields Water molecules orient back and forth Liquid water heats due to molecular friction Ice doesn t heat due to orientational stiffness Steam doesn t heat due to lack of friction Food s liquid water content heats the food Radio 21 Question 2 Radio 22 Introductory Question (revisited) Q: How does metal respond to microwaves? A: Currents flow back and forth in the metal. Non-conductors polarize in the microwaves Conductors carry currents in the microwaves Good, thick conductors reflect microwaves Poor or thin conductors experience resistive heating Sharp conductors initiate discharges in the air If you put a CD in a microwave oven, it will A. do nothing. B. burn up the microwave oven. C. burn up the CD. Radio 23 Question 3 Radio 24 Question 4 Q: Why do microwave ovens tend to cook unevenly? A: Interference produces nonuniform electric fields. Interference is when the fields add or cancel Adding fields are constructive interference Canceling fields are destructive interference Reflections lead to interference in a microwave Most ovens stir the waves or move the food Q: How does the oven create its microwaves? A: A magnetron tube radiates microwaves. Magnetrons are vacuum tubes invented in WWII Electrons travel through empty space obtaining power from a strong electric field bent by a strong magnetic field and the Lorentz force delivering power to an electromagnetic field 4
5 Radio 25 Generating Microwaves Magnetron tube has tank circuits in it Streams of electrons amplify tank oscillations A loop of wire extracts energy from the tanks A short ¼-wave antenna emits the microwaves Radio 26 Summary about They cook food because of its water content Polar water molecules heat in microwave fields Thin or sharp metals overheat or spark The microwaves are produced by a magnetrons 5
Chapter 21. Alternating Current Circuits and Electromagnetic Waves
Chapter 21 Alternating Current Circuits and Electromagnetic Waves AC Circuit An AC circuit consists of a combination of circuit elements and an AC generator or source The output of an AC generator is sinusoidal
More informationChapter 25. Electromagnetic Waves
Chapter 25 Electromagnetic Waves EXAM # 3 Nov. 20-21 Chapter 23 Chapter 25 Powerpoint Nov. 4 Problems from previous exams Physics in Perspective (pg. 836 837) Chapter 25 Electromagnetic Waves Units of
More informationLecture PowerPoints. Chapter 22 Physics: Principles with Applications, 7 th edition Giancoli
Lecture PowerPoints Chapter 22 Physics: Principles with Applications, 7 th edition Giancoli This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching
More informationExperiment 12: Microwaves
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics 8.02 Spring 2005 OBJECTIVES Experiment 12: Microwaves To observe the polarization and angular dependence of radiation from a microwave generator
More informationChapter 23 Electromagnetic Waves Lecture 14
Chapter 23 Electromagnetic Waves Lecture 14 23.1 The Discovery of Electromagnetic Waves 23.2 Properties of Electromagnetic Waves 23.3 Electromagnetic Waves Carry Energy and Momentum 23.4 Types of Electromagnetic
More informationTerm Info Picture. A wave that has both electric and magnetic fields. They travel through empty space (a vacuum).
Waves S8P4. Obtain, evaluate, and communicate information to support the claim that electromagnetic (light) waves behave differently than mechanical (sound) waves. A. Ask questions to develop explanations
More informationLECTURE 20 ELECTROMAGNETIC WAVES. Instructor: Kazumi Tolich
LECTURE 20 ELECTROMAGNETIC WAVES Instructor: Kazumi Tolich Lecture 20 2 25.6 The photon model of electromagnetic waves 25.7 The electromagnetic spectrum Radio waves and microwaves Infrared, visible light,
More informationJames Clerk Maxwell. Electric and Magnetic Fields
L 30 Electricity and Magnetism [7] Electromagnetic Waves Faraday laid the groundwork with his discovery of electromagnetic induction Maxwell added the last piece of the puzzle Hertz made the experimental
More informationWAVES & EM SPECTRUM. Chapters 10 & 15
WAVES & EM SPECTRUM Chapters 10 & 15 What s a wave? repeating disturbance transfers energy through matter or space Oscillation back & forth movement carries energy w/o transporting matter can travel through
More informationLesson Objectives: The electromagnetic spectrum: To know the parts of To know their properties, uses, dangers
03/02/2014 Electromagnetic Spectrum Review Using Waves Lesson Objectives: The electromagnetic spectrum: To know the parts of To know their properties, uses, dangers To compare and contrast analogue and
More informationElectromagnetic Waves
Electromagnetic Waves What is an Electromagnetic Wave? An EM Wave is a disturbance that transfers energy through a field. A field is a area around an object where the object can apply a force on another
More informationIntroductory Physics, High School Learning Standards for a Full First-Year Course
Introductory Physics, High School Learning Standards for a Full First-Year Course I. C ONTENT S TANDARDS 4.1 Describe the measurable properties of waves (velocity, frequency, wavelength, amplitude, period)
More informationChapter 18 The Electromagnetic Spectrum and Light
Chapter 18 Sections 18.1 Electromagnetic Waves 18.2 The 18.3 Behavior of Light 18.4 Color 18.5 Sources of Light Chapter 18 The and Light Section 18.1 Electromagnetic Waves To review: mechanical waves require
More informationPhysics 1C. Lecture 24A. Finish Chapter 27: X-ray diffraction Start Chapter 24: EM waves. Average Quiz score = 6.8 out of 10.
Physics 1C Lecture 24A Finish Chapter 27: X-ray diffraction Start Chapter 24: EM waves Average Quiz score = 6.8 out of 10 This is a B- Diffraction of X-rays by Crystals! X-rays are electromagnetic radiation
More informationIn an unmagnetized piece of iron, the atoms are arranged in domains. In each domain the atoms are aligned, but the domains themselves are random.
4/7 Properties of the Magnetic Force 1. Perpendicular to the field and velocity. 2. If the velocity and field are parallel, the force is zero. 3. Roughly (field and vel perp), the force is the product
More informationHuman Retina. Sharp Spot: Fovea Blind Spot: Optic Nerve
I am Watching YOU!! Human Retina Sharp Spot: Fovea Blind Spot: Optic Nerve Human Vision Optical Antennae: Rods & Cones Rods: Intensity Cones: Color Energy of Light 6 10 ev 10 ev 4 1 2eV 40eV KeV MeV Energy
More informationWaves Review Checklist Pulses 5.1.1A Explain the relationship between the period of a pendulum and the factors involved in building one
5.1.1 Oscillating Systems Waves Review hecklist 5.1.2 Pulses 5.1.1A Explain the relationship between the period of a pendulum and the factors involved in building one Four pendulums are built as shown
More information22-1 (SJP, Phys 2020, Fa '01)
22-1 (SJP, Phys 2020, Fa '01) Ch. 22: Electromagnetic waves. We ve seen some of the ideas/discoveries of Ampere, Faraday, and others. So far, E & B seem different but somehow related. In what is perhaps
More informationIntermediate Physics PHYS102
Intermediate Physics PHYS102 Dr Richard H. Cyburt Assistant Professor of Physics My office: 402c in the Science Building My phone: (304) 384-6006 My email: rcyburt@concord.edu My webpage: www.concord.edu/rcyburt
More informationELECTROMAGNETIC WAVES AND THE EM SPECTRUM MR. BANKS 8 TH GRADE SCIENCE
ELECTROMAGNETIC WAVES AND THE EM SPECTRUM MR. BANKS 8 TH GRADE SCIENCE ELECTROMAGNETIC WAVES Do not need matter to transfer energy. Made by vibrating electric charges. When an electric charge vibrates,
More informationGeneral Physics (PHY 2140)
General Physics (PHY 2140) Lecture 11 Electricity and Magnetism AC circuits and EM waves Resonance in a Series RLC circuit Transformers Maxwell, Hertz and EM waves Electromagnetic Waves 6/18/2007 http://www.physics.wayne.edu/~alan/2140website/main.htm
More informationLecture Outlines Chapter 25. Physics, 3 rd Edition James S. Walker
Lecture Outlines Chapter 25 Physics, 3 rd Edition James S. Walker 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in
More informationIntroduction 1. The Experimental Method
8.02 Fall 2001 A Microwave Generator, Receiver, and Reflector 1 Introduction 1 Hertz first generated electromagnetic waves in 1888, and we replicate Hertz s original experiment here. The method he used
More informationSkoog Chapter 1 Introduction
Skoog Chapter 1 Introduction Basics of Instrumental Analysis Properties Employed in Instrumental Methods Numerical Criteria Figures of Merit Skip the following chapters Chapter 2 Electrical Components
More informationINTRODUCTION. 5. Electromagnetic Waves
INTRODUCTION An electric current produces a magnetic field, and a changing magnetic field produces an electric field Because of such a connection, we refer to the phenomena of electricity and magnetism
More informationMODULE P6: THE WAVE MODEL OF RADIATION OVERVIEW
OVERVIEW Wave behaviour explains a great many phenomena, both natural and artificial, for all waves have properties in common. The first topic introduces a basic vocabulary for describing waves. Reflections
More informationWaves Mechanical vs. Electromagnetic Mechanical Electromagnetic Transverse vs. Longitudinal Behavior of Light
PSC1341 Chapter 4 Waves Chapter 4: Wave Motion A.. The Behavior of Light B. The E-M spectrum C. Equations D. Reflection, Refraction, Lenses and Diffraction E. Constructive Interference, Destructive Interference
More informationCHAPTER 17 AND 18 CHARACTERISTICS OF EM WAVES LEARNING OBJECTIVES CHARACTERISTICS OF EM WAVES 11/10/2014
STUDENT LEARNING GOALS PHYSICAL SCIENCE ELECTROMAGNETISM SC.912.P.10.18 CHAPTER 17 AND 18 Electromagnetic Spectrum, Light, and Sound Goal: Explore the theory of electromagnetism by comparting and contrasting
More informationNote 2 Electromagnetic waves N2/EMWAVES/PHY/XII/CHS2012
ELECTROMAGNETIC SPECTRUM Electromagnetic waves include visible light waves, X-rays, gamma rays, radio waves, microwaves, ultraviolet and infrared waves. The classification of em waves according to frequency
More informationConceptual Physics Fundamentals
Conceptual Physics Fundamentals Chapter 13: LIGHT WAVES This lecture will help you understand: Electromagnetic Spectrum Transparent and Opaque Materials Color Why the Sky is Blue, Sunsets are Red, and
More informationOSCILLATIONS and WAVES
OSCILLATIONS and WAVES Oscillations Oscillations are vibrations which repeat themselves. EXAMPLE: Oscillations can be driven externally, like a pendulum in a gravitational field EXAMPLE: Oscillations can
More informationElectromagnetic Spectrum
Electromagnetic Spectrum The electromagnetic radiation covers a vast spectrum of frequencies and wavelengths. This includes the very energetic gamma-rays radiation with a wavelength range from 0.005 1.4
More informationChapter 16 Light Waves and Color
Chapter 16 Light Waves and Color Lecture PowerPoint Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. What causes color? What causes reflection? What causes color?
More informationChapter 18 The Electromagnetic Spectrum
Pearson Prentice Hall Physical Science: Concepts in Action Chapter 18 The Electromagnetic Spectrum 18.1 Electromagnetic Waves Objectives: 1. Describe the characteristics of electromagnetic waves in a vacuum
More informationWaves. A wave is a disturbance which travels through a vacuum or medium (air, water, etc) that contains matter A wave transports ENERGY not matter
Waves and Optics Waves A wave is a disturbance which travels through a vacuum or medium (air, water, etc) that contains matter A wave transports ENERGY not matter Waves Some waves do not need a medium
More informationAntenna? What s That? Chet Thayer WA3I
Antenna? What s That? Chet Thayer WA3I Space: The Final Frontier Empty Space (-Time) Four dimensional region that holds everything Is Permeable : It requires energy to set up a magnetic field within it.
More informationElectromagnetic (Light) Waves Electromagnetic Waves
Physics R Date: Review Questions 1. An ocean wave traveling at 3 m/s has a wavelength of 1.6 meters. a. What is the frequency of the wave? b. What is the period of the wave? Electromagnetic (Light) Waves
More informationELECTROMAGNETIC SPECTRUM ELECTROMAGNETIC SPECTRUM
LECTURE:2 ELECTROMAGNETIC SPECTRUM ELECTROMAGNETIC SPECTRUM Electromagnetic waves: In an electromagnetic wave the electric and magnetic fields are mutually perpendicular. They are also both perpendicular
More informationRadios and radiowaves
Radios and radiowaves Physics 1010: Dr. Eleanor Hodby Day 26: Radio waves Reminders: HW10 due Monday Nov 30th at 10pm. Regular help session schedule this week Final: Monday Dec 14 at 1.30-4pm Midterm 1
More informationElectromagnetic Waves & the Electromagnetic Spectrum
Electromagnetic Waves & the Electromagnetic Spectrum longest wavelength shortest wavelength The Electromagnetic Spectrum The name given to a group of energy waves that are mostly invisible and can travel
More informationLesson 24 Electromagnetic Waves
Physics 30 Lesson 24 Electromagnetic Waves On April 11, 1846, Michael Faraday was scheduled to introduce Sir Charles Wheatstone at a meeting of the Royal Society of London. Unfortunately, Wheatstone had
More informationLecture Notes (Electric & Magnetic Fields in Space)
James C. Maxwell: Lecture Notes (Electric & Magnetic Fields in Space) - Maxwell (1831-1879) was a Scottish physicist who is generally regarded as the most profound and productive physicist between the
More informationTechnician License Course Chapter 4. Lesson Plan Module 9 Antenna Fundamentals, Feed Lines & SWR
Technician License Course Chapter 4 Lesson Plan Module 9 Antenna Fundamentals, Feed Lines & SWR The Antenna System Antenna: Transforms current into radio waves (transmit) and vice versa (receive). Feed
More informationSection Electromagnetic Waves and the Electromagnetic Spectrum
Section 18.6 Electromagnetic Waves and the Electromagnetic Spectrum Electromagnetic Waves Electromagnetic Waves Electromagnetic waves are transverse waves produced by the motion of electrically charged
More informationElectromagnetic Radiation
Electromagnetic Radiation EMR Light: Interference and Optics I. Light as a Wave - wave basics review - electromagnetic radiation II. Diffraction and Interference - diffraction, Huygen s principle - superposition,
More informationELECTROMAGNETIC WAVES AND LIGHT. Physics 5 th Six Weeks
ELECTROMAGNETIC WAVES AND LIGHT Physics 5 th Six Weeks What are Electromagnetic Waves Electromagnetic Waves Sound and water waves are examples of waves resulting from energy being transferred from particle
More informationP6 Quick Revision Questions
P6 Quick Revision Questions H = Higher tier only SS = Separate science only Question 1... of 50 Define wavelength Answer 1... of 50 The distance from a point on one wave to the equivalent point on the
More informationWaves. Electromagnetic & Mechanical Waves
Waves Electromagnetic & Mechanical Waves Wave Definition: A disturbance that transfers energy from place to place. Molecules pass energy to neighboring molecules who pass energy to neighboring molecules
More informationWave & Electromagnetic Spectrum Notes
Wave & Electromagnetic Spectrum Notes December 17, 2011 I.) Properties of Waves A) Wave: A periodic disturbance in a solid, liquid or gas as energy is transmitted through a medium ( Waves carry energy
More informationElectromagnetic Spectrum
Electromagnetic Spectrum Wave - Review Waves are oscillations that transport energy. 2 Types of waves: Mechanical waves that require a medium to travel through (sound, water, earthquakes) Electromagnetic
More informationUses of Electromagnetic Waves
Uses of Electromagnetic Waves 1 of 42 Boardworks Ltd 2016 Uses of Electromagnetic Waves 2 of 42 Boardworks Ltd 2016 What are radio waves? 3 of 42 Boardworks Ltd 2016 The broadcast of every radio and television
More informationNATIONAL SENIOR CERTIFICATE GRADE 10
NATIONAL SENIOR CERTIFICATE GRADE 10 PHYSICAL SCIENCES: PHYSICS (P1) JUNE 2016 MARKS: 150 DURATION: 2 hours DATE: 13-06-2016 This question paper consists of 11 pages including the data sheet INSTRUCTIONS
More information24.3 Production of Electromagnetic Waves *
OpenStax-CNX module: m52452 1 24.3 Production of Electromagnetic Waves * Bobby Bailey Based on Production of Electromagnetic Waves by OpenStax This work is produced by OpenStax-CNX and licensed under the
More informationHighly efficient water heaters using magnetron effects
Highly efficient water heaters using magnetron effects Technical task of this project is maximum heat output and minimum electric input of power. This research project has several stages of development.
More informationNational 4. Waves and Radiation. Summary Notes. Name:
National 4 Waves and Radiation Summary Notes Name: Mr Downie 2014 1 Sound Waves To produce a sound the particles in an object must vibrate. This means that sound can travel through solids, liquids and
More informationLect2: EM Radio Waves and Antenna Operation
Lect2: EM Radio Waves and Antenna Operation Dr. Yazid Khattabi Communication Systems Course EE Department University of Jordan 2018 Dr. Yazid Khattabi. The University of Jordan. 1 EM Radio Waves In wireless
More informationELECTROMAGNETIC WAVES MARKS WEIGHTAGE 3 marks
ELECTROMAGNETIC WAVES MARKS WEIGHTAGE 3 marks QUICK REVISION (Important Concepts & Formulas) Electromagnetic radiation is the radiation in which associated electric and magnetic field oscillations are
More informationElectromagnetic Waves Chapter Questions
Electromagnetic Waves Chapter Questions 1. Sir Isaac Newton was one of the first physicists to study light. What properties of light did he explain by using the particle model? 2. Who was the first person
More informationNEW YORK STATE TEACHER CERTIFICATION EXAMINATIONS
NEW YORK STATE TEACHER CERTIFICATION EXAMINATIONS TEST DESIGN AND FRAMEWORK June 2018 Authorized for Distribution by the New York State Education Department This test design and framework document is designed
More informationHow Radio Works By Marshall Brain
How Radio Works By Marshall Brain Excerpted from the excellent resource http://electronics.howstuffworks.com/radio.htm Radio waves transmit music, conversations, pictures and data invisibly through the
More informationCommunication and signals. Book page Syllabus
Communication and signals Book page 103 105 Syllabus 3.23 3.25 What do these have to do with one another? Homer and the Internet What are the codes they use? Do you know what changed WWII? The Imitation
More information... frequency, f speed, v......
PhysicsAndMathsTutor.com 1 1. Define the terms wavelength, frequency and speed used to describe a progressive wave. wavelength, λ... frequency, f... speed, v... Hence derive the wave equation v = fλ which
More informationPhysics 1502: Lecture 26 Today s Agenda
Phsics 1502: Lecture 26 Toda s Agenda Announcements: Midterm 2: NOT Nov. 6 About Monda Nov. 16 Homework 07: due Frida this week Electromagnetic Waves Mawell s Equations - Revised Energ and Momentum in
More informationCalifornia State University, Bakersfield. Signals and Systems. Luis Medina,
Luis Medina, Department of Electrical and Computer Engineering, California State University, Bakersfield Lecture 9 (Intro, History and Background) July 29 th, 2013 1 Electric Fields An electric field surrounds
More informationLecture Presentation Chapter 25 EM Induction and EM Waves
Lecture Presentation Chapter 25 EM Induction and EM Waves Suggested Videos for Chapter 25 Prelecture Videos Electromagnetic Induction Faraday s Law and Lenz s Law Electromagnetic Waves Class Videos Faraday
More information17-1 Electromagnetic Waves
17-1 Electromagnetic Waves transfers energy called electromagnetic radiation no medium needed transverse some electrical, some magnetic properties speed is 300,000,000 m/s; nothing is faster; at this speed
More informationWave Behavior and The electromagnetic Spectrum
Wave Behavior and The electromagnetic Spectrum What is Light? We call light Electromagnetic Radiation. Or EM for short It s composed of both an electrical wave and a magnetic wave. Wave or particle? Just
More informationLight waves. VCE Physics.com. Light waves - 2
Light waves What is light? The electromagnetic spectrum Waves Wave equations Light as electromagnetic radiation Polarisation Colour Colour addition Colour subtraction Interference & structural colour Light
More informationSCI-PS Light and Optics Pre Assessment Exam not valid for Paper Pencil Test Sessions
SCI-PS Light and Optics Pre Assessment Exam not valid for Paper Pencil Test Sessions [Exam ID:1TL2E1 1 If the angle of incidence is 45, what is the angle of reflection? A 120 B 50 C 90 D 45 2 The wave
More informationSection Electromagnetic Waves and the Electromagnetic Spectrum
Section 17.6 Electromagnetic Waves and the Electromagnetic Spectrum Electromagnetic Waves Can you name all the colors of the rainbow? Red, Orange, Yellow, Green, Blue, Indigo, Violet Electromagnetic Waves
More informationConsider the following configuration of field lines. This could be a... A: E-field. B: B-field. C: Either E or B
(EMWaves-1) Consider the following configuration of field lines. This could be a... A: E-field B: B-field C: Either E or B Answer: either E or B. Both B-field lines and E-field lines generated by changing
More informationOrdinary Level SOLUTIONS: WAVES, SOUND AND LIGHT.
Ordinary Level SOLUTIONS: WAVES, SOUND AND LIGHT. 2015 Question 7 [Ordinary Level] (i) Explain the term resonance. transfer of energy between objects of similar natural frequency (ii) Describe a laboratory
More informationAP PHYSICS WAVE BEHAVIOR
AP PHYSICS WAVE BEHAVIOR NAME: HB: ACTIVITY I. BOUNDARY BEHAVIOR As a wave travels through a medium, it will often reach the end of the medium and encounter an obstacle or perhaps another medium through
More informationHow Radio Works by Marshall Brain
How Radio Works by Marshall Brain "Radio waves" transmit music, conversations, pictures and data invisibly through the air, often over millions of miles -- it happens every day in thousands of different
More informationMagnetism can produce electric current can. produce magnetism Electromagnetic Induction
Magnetism can produce electric current, and electric current can produce magnetism. In 1831, two physicists, Michael Faraday in England and Joseph Henry in the United States, independently discovered that
More informationMicrowaves 05/18/2006. Lecture 14 1
Shielding and Faraday Cages What keeps microwaves in the microwave? Why is cell reception terrible in elevators? Why is it safe to be in a car in a lightning storm? How can satellite dishes work with just
More informationElectronics Interview Questions
Electronics Interview Questions 1. What is Electronic? The study and use of electrical devices that operate by controlling the flow of electrons or other electrically charged particles. 2. What is communication?
More informationAntennas 101 Don t Be a 0.97 db Weakling! Ward Silver NØAX
Antennas 101 Don t Be a 0.97 db Weakling! Ward Silver NØAX Overview Antennas 101 2 Overview Basic Antennas: Ground Plane / Dipole How Gain and Nulls are Formed How Phased Arrays Work How Yagis Work (simplified)
More informationTAP 313-1: Polarisation of waves
TAP 313-1: Polarisation of waves How does polarisation work? Many kinds of polariser filter out waves, leaving only those with a polarisation along the direction allowed by the polariser. Any kind of transverse
More informationDate Period Name. Write the term that corresponds to the description. Use each term once. beat
Date Period Name CHAPTER 15 Study Guide Sound Vocabulary Review Write the term that corresponds to the description. Use each term once. beat Doppler effect closed-pipe resonator fundamental consonance
More information$100 $400 $400 $400 $500
$100 $100 $100 $100 $100 $200 $200 $200 $200 $200 $300 $300 $300 $300 $300 $400 $400 $400 $400 $400 $500 $500 $500 $500 $500 MOVING IN WAVES PURE ENERGY! WHAT S THE FREQUENCY, KENNETH? USE IT OR LOSE IT
More informationThe topics in this unit are:
The topics in this unit are: 1 Types of waves 2 Describing waves 3 Wave equation 4 Reflection of waves 5 Refraction 6 Diffraction 7 Light waves (reflection) 8 Total internal reflection 9 - Optical fibres
More informationLecture Notes Prepared by Prof. J. Francis Spring Remote Sensing Instruments
Lecture Notes Prepared by Prof. J. Francis Spring 2005 Remote Sensing Instruments Material from Remote Sensing Instrumentation in Weather Satellites: Systems, Data, and Environmental Applications by Rao,
More informationExam 3 Solutions. ! r, the ratio is ( N ) ( ) ( )( ) 2. PHY2054 Spring Prof. Pradeep Kumar Prof. Paul Avery Prof. Yoonseok Lee Mar.
PHY054 Spring 009 Prof. Pradeep Kumar Prof. Paul Avery Prof. Yoonseok Lee Mar. 7, 009 Exam 3 Solutions 1. Two coils (A and B) made out of the same wire are in a uniform magnetic field with the coil axes
More informationWAVE MOTION. Challenging MCQ questions by The Physics Cafe. Compiled and selected by The Physics Cafe
WVE MOTION hallenging MQ questions by The Physics afe ompiled and selected by The Physics afe 1 progressive wave in a stretched string has a speed of 2 m s -1 and a frequency of 100 Hz. What is the phase
More informationELECTROMAGNETIC WAVES HERTZ S EXPERIMENTS & OBSERVATIONS
VISUAL PHYSICS ONLINE MODULE 7 NATURE OF LIGHT ELECTROMAGNETIC WAVES HERTZ S EXPERIMENTS & OBSERVATIONS PRODUCTION & RECEPTION OF RADIO WAVES Heinrich Rudolf Hertz (1857 1894) was a German physicist who
More informationAnnouncements. EM Induction. Faraday s Law 4/24/15. Why is current induced? EM Induction: Current is Induced
Announcements Today: Induction & transformers Wednesday: Finish transformers, start light Reading: review Fig. 26.3 and Fig. 26.8 Recall: N/S poles (opposites attract) Moving electrical charges produce
More informationRadio Merit Badge Boy Scouts of America
Radio Merit Badge Boy Scouts of America Module 2 Electronics, Safety & Careers BSA National Radio Scouting Committee2012 Class Format Three modules any order Module 1 Intro To Radio Module 2 Electronic
More information(A) 2f (B) 2 f (C) f ( D) 2 (E) 2
1. A small vibrating object S moves across the surface of a ripple tank producing the wave fronts shown above. The wave fronts move with speed v. The object is traveling in what direction and with what
More informationTechnician License. Course
Technician License Course Technician License Course Chapter 4 Lesson Plan Module - 9 Antenna Fundamentals Feed Lines & SWR The Antenna System The Antenna System Antenna: Transforms current into radio waves
More information37 Electromagnetic Induction. Magnetism can produce electric current, and electric current can produce magnetism.
Magnetism can produce electric current, and electric current can produce magnetism. In 1831, two physicists, Michael Faraday in England and Joseph Henry in the United States, independently discovered that
More informationPHYSICS - Chapter 16. Light and Color and More
PHYSICS - Chapter 16 Light and Color and More LIGHT-fundamentals 16.1 Light is the visible part of the electromagnetic spectrum. The electromagnetic spectrum runs from long Radio and TV waves to short
More informationChapter 24. Electromagnetic Waves
Chapter 24 Electromagnetic Waves 24.1 The Nature of Electromagnetic Waves Two straight wires connected to the terminals of an AC generator can create an electromagnetic wave. Only the electric wave traveling
More informationChapter PREPTEST: SHM & WAVE PROPERTIES
2 4 Chapter 13-14 PREPTEST: SHM & WAVE PROPERTIES Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A load of 45 N attached to a spring that is hanging vertically
More informationHigh frequency sounds, beyond the range of human hearing, are called ultrasound.
Mr Downie 2014 1 Sound Waves To produce a sound the particles in an object must vibrate. This means that sound can travel through solids, liquids and gases. Sound cannot travel through a vacuum as it contains
More informationEE 42/100 Lecture 18: RLC Circuits. Rev A 3/17/2010 (3:48 PM) Prof. Ali M. Niknejad
A. M. Niknejad University of California, Berkeley EE 100 / 42 Lecture 18 p. 1/19 EE 42/100 Lecture 18: RLC Circuits ELECTRONICS Rev A 3/17/2010 (3:48 PM) Prof. Ali M. Niknejad University of California,
More informationSection 1: Sound. Sound and Light Section 1
Sound and Light Section 1 Section 1: Sound Preview Key Ideas Bellringer Properties of Sound Sound Intensity and Decibel Level Musical Instruments Hearing and the Ear The Ear Ultrasound and Sonar Sound
More informationTopic 4: Waves 4.2 Traveling waves
Crests and troughs Compare the waves traveling through the mediums of rope and spring. CREST TROUGH TRANSVERSE WAVE COMPRESSION RAREFACTION LONGITUDINAL WAVE Wave speed and frequency The speed at which
More informationMITOCW radio_receivers
MITOCW radio_receivers Lot's of things in our lives transmit signals. From your cell phone when it's making a call, to your computer when it's sending an email, to your local radio station when it's broadcasting.
More informationSlide 1 / 99. Electromagnetic Waves
Slide 1 / 99 Electromagnetic Waves Slide 2 / 99 The Nature of Light: Wave or Particle The nature of light has been debated for thousands of years. In the 1600's, Newton argued that light was a stream of
More information