A mechanical wave is a disturbance which propagates through a medium with little or no net displacement of the particles of the medium.

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1 Waves and Sound

2 Mechanical Wave A mechanical wave is a disturbance which propagates through a medium with little or no net displacement of the particles of the medium. Water Waves Wave Pulse People Wave Animation courtesy of Dr. Dan Russell, Kettering University

3 Parts of a Wave 3 crest : wavelength equilibrium A: amplitude -3 y(m) x(m) trough

4 Speed of a wave The speed of a wave is the distance traveled by a given point on the wave (such as a crest) in a given interval of time. v = d/t d: distance (m) t: time (s) v = ƒ v : speed (m /s) : wavelength (m) ƒ : frequency (s 1, Hz)

5 Period of a wave T = 1/ƒ T : period (s) ƒ : frequency (s -1, Hz)

6 Problem: Sound travels at approximately 340 m/s, and light travels at 3.0 x 10 8 m/s. How far away is a lightning strike if the sound of the thunder arrives at a location 2.0 seconds after the lightning is seen?

7 Problem: The frequency of an oboe s A is 440 Hz. What is the period of this note? What is the wavelength? Assume a speed of sound in air of 340 m/s.

8 Types of Waves Refraction and Reflection

9 Wave Types A transverse wave is a wave in which particles of the medium move in a direction perpendicular to the direction which the wave moves. Example: Waves on a String A longitudinal wave is a wave in which particles of the medium move in a direction parallel to the direction which the wave moves. These are also called compression waves. Example: sound

10 Wave types: transverse

11 Wave types: longitudinal

12 Longitudinal vs Transverse

13 Other Wave Types Earthquakes: combination Ocean waves: surface Light: electromagnetic

14 Reflection of waves Occurs when a wave strikes a medium boundary and bounces back into original medium. Completely reflected waves have the same energy and speed as original wave.

15 Reflection Types Fixed-end reflection: The wave reflects with inverted phase. Open-end reflection: The wave reflects with the same phase Animation courtesy of Dr. Dan Russell, Kettering University

16 Refraction of waves Transmission of wave from one medium to another. Refracted waves may change speed and wavelength. Refraction is almost always accompanied by some reflection. Refracted waves do not change frequency. Animation courtesy of Dr. Dan Russell, Kettering University

17 Sound is a longitudinal wave Sound travels through the air at approximately 340 m/s. It travels through other media as well, often much faster than that! Sound waves are started by vibration of some other material, which starts the air moving. Animation courtesy of Dr. Dan Russell, Kettering University

18 Hearing Sounds We hear a sound as high or low depending on its frequency or wavelength. Sounds with short wavelengths and high frequencies sound high-pitched to our ears, and sounds with long wavelengths and low frequencies sound low-pitched. The range of human hearing is from about 20 Hz to about 20,000 Hz. The amplitude of a sound s vibration is interpreted as its loudness. We measure the loudness (also called sound intensity) on the decibel scale, which is logarithmic. Tom Henderson,

19 Calculating Sound Intensity β = 10 log I / Io β is sound level in decibels (db) I is the sound intensity (W/m 2 ) Io is the threshold of hearing, minimum sound intensity perceived by the ear. Io = 1 x W/m 2

20 The Doppler Effect is the raising or lowering of the perceived pitch of a sound based on the relative motion of observer and source of the sound. When a car blowing its horn races toward you, the sound of its horn appears higher in pitch, since the wavelength has been effectively shortened by the motion of the car relative to you. The opposite happens when the car races away. Doppler Effect

21 Doppler Effect Stationary source Moving source Animations courtesy of Dr. Dan Russell, Kettering University Supersonic source

22 Doppler Equation Use the top signs when approaching & bottom sign when receding

23 Pure Sounds Sounds are longitudinal waves, but if we graph them right, we can make them look like transverse waves. When we graph the air motion involved in a pure sound tone versus position, we get what looks like a sine or cosine function. A tuning fork produces a relatively pure tone. So does a human whistle. Later in the period, we will sample various pure sounds and see what they look like.

24 Graphing a Sound Wave

25 Complex Sounds Because of the phenomena of superposition and interference real world waveforms may not appear to be pure sine or cosine functions. That is because most real world sounds are composed of multiple frequencies. The human voice and most musical instruments produce complex sounds.

26 Superposition of Waves

27 Principle of Superposition When two or more waves pass a particular point in a medium simultaneously, the resulting displacement at that point in the medium is the sum of the displacements due to each individual wave. The waves interfere with each other.

28 Types of interference. If the waves are in phase, that is crests and troughs are aligned, the amplitude is increased. This is called constructive interference. If the waves are out of phase, that is crests and troughs are completely misaligned, the amplitude is decreased and can even be zero. This is called destructive interference.

29 Constructive Interference crests aligned with crest waves are in phase

30 Constructive Interference

31 Destructive Interference crests aligned with troughs waves are out of phase

32 Destructive Interference

33 Sample Problem: Draw the waveform from its two components.

34 Sample Problem: Draw the waveform from its two components.

35 Standing Waves

36 Standing Wave A standing wave is a wave which is reflected back and forth between fixed ends (of a string or pipe, for example). Reflection may be fixed or open-ended. Superposition of the wave upon itself results in a pattern of constructive and destructive interference and an enhanced wave. Let s see a simulation.

37 Fixed-end standing waves (violin string) 1 st harmonic 2 nd harmonic Animation available at: 3 rd harmonic

38 Fixed-end standing waves (violin string) L Fundamental First harmonic = 2L First Overtone Second harmonic = L Second Overtone Third harmonic = 2L/3

39 Open-end standing waves (organ pipes) L Fundamental First harmonic = 2L First Overtone Second harmonic = L Second Overtone Third harmonic = 2L/3

40 Mixed standing waves (some organ pipes) L First harmonic = 4L Second harmonic = (4/3)L Third harmonic = (4/5)L

41 Sample Problem How long do you need to make an organ pipe that produces a fundamental frequency of middle C (256 Hz)? The speed of the sound in air is 340 m/s. A) Draw the standing wave for the first harmonic B) Calculate the pipe length. C) What is the wavelength and frequency of the 2 nd harmonic? Draw the standing wave

42 Resonance and Beats

43 Sample Problem How long do you need to make an organ pipe whose fundamental frequency is a middle C (256 Hz)? The pipe is closed on one end, and the speed of sound in air is 340 m/s. A) Draw the situation. B) Calculate the pipe length. C) What is the wavelength and frequency of the 2 nd harmonic?

44 Resonance Resonance occurs when a vibration from one oscillator occurs at a natural frequency for another oscillator. The first oscillator will cause the second to vibrate. Demonstration.

45 Beats Beats is the word physicists use to describe the characteristic loud-soft pattern that characterizes two nearly (but not exactly) matched frequencies. Musicians call this being out of tune. Let s hear (and see) a demo of this phenomenon.

46 What word best describes this to physicists? Amplitude Answer: beats

47 What word best describes this to musicians? Amplitude Answer: bad intonation (being out of tune)

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