Book page Syllabus cgrahamphysics.com EM spectrum

Transcription

1 Book page Syllabus EM spectrum

2 Find the odd ones out

3 What do all these waves have in common They all belong to the EM spectrum They all travel at the speed of light They are all transverse waves They can all travel through vacuum

4 Aim Be in charge of your own learning. Follow the learning map and finish all tasks Key words Electromagnetic Spectrum Gamma rays 감마선 X-rays 엑스레이 Ultra Violet 자외선 Visible ( 눈에 ) 보이는, 보일수있는 Infrared 적외선 Microwaves 전자레인지 Radio 라디오

5 How were the invisible parts of the EM spectrum discovered? The Big Picture Have you ever wondered

6 Learning Outcomes 1. Know the electromagnetic spectrum 2. Identify the order of the EM spectrum in terms of: - frequency - wavelength - speed and colour for visible light - use the equation v = λf 3. Explain uses of electromagnetic radiation 4. Understand the dangers of EM radiation and how to protect against the risks of EM radiation EM spectrum DISCOVERY LESSON TASK You need to find out the information for yourself that will help you understand the learning outcomes. After two lessons you should be confident you understand all of these. Below I have listed different tasks you need to complete to help you understand the topic. Remember that there are two types of waves: transverse and longitudinal. Investigate to which category EM waves belong. Identify the different parts of the EM spectrum Organize the waves in terms of wavelength, frequency and energy transfer. Find a n acronym to remember the order of EM waves.. Task 1: Produce a visual representation of all the information. You can chose a poster, a timeline, a model or any other representation Investigate the uses of EM waves. Task 3: Make a slide show for each type of wave. Include the source, the energy, wavelength and speed of this wave and which property makes this type unique for a specific use You must include at least two photos per slide, but you can use more. You cannot use more than 10 words on each slide and you can only make one slide for each type of wave. Keep some space to include the dangers from the next task NEUTRALISATION Now that you know the uses of EM waves, find out some information about their dangers. Add these to your slide Find some information out about how to protect yourself and others from the dangers of radiation. Add this information to your slide Now that you can recall the order of EM waves you need to find out how to calculate further information. Find out: - How to calculate the speed, frequency and wavelength of EM waves. - What all EM waves have in common - How EM waves are different from each other. - What is ionizing radiation and which parts of the EM spectrum are they found Homework: Complete past paper exam questions. Task 5: Test your knowledge by completing the quiz on edpuzzle, logging in with the code epzqr1 Use BBC bitesize and the Powerpoints on my website to help you find out the information. Create a table to show differences and similarities of EM waves. Task 2: Complete WS 1. Check your answers with the teacher

7 Uses

8 Radio waves Communication

9 Text Microwaves Communication

10 Infra Red TV remote control Burglar alarm Rescuing people

11 Visible Light Used in iris scanning

12 Text Ultraviolet

13 Text X-rays

14 Gamma rays Sterilising food Sterilising medical equipment Treating cancer

15 Dangers

16 EM Radiation: Gamma Uses: Kills harmful bacteria in food, sterilising surgical equipment, killing cancer cells. Dangers: High doses can kill cells. Lower doses can cause cells to become cancerous.

17 EM Radiation: X rays Uses: Shadow pictures of luggage and inside the human body. Dangers: High doses can kill cells. Lower doses can cause cells to become cancerous. How do hospital workers limit their exposure to Gamma and X rays? Hospital workers limit exposure to Gamma and X rays by standing behind lead shields or by leaving the room when the radiations are being used.

18 EM Radiation: Ultraviolet Uses: Sun beds, fluorescent lamps and security marking. Dangers: High doses can kill cells. Lower doses can cause cells to become cancerous. Which type of radiation is the most dangerous? The higher the frequency of the radiation, the more dangerous it is. So gamma is more dangerous than X rays or ultraviolet.

19 EM Radiation: Light Uses: Iris scanning and endoscopes Dangers: Blindness

20 EM Radiation: Infrared Uses: Remote controls (TV/VCR), radiant heaters, grills, optical fibre communication, night vision. Dangers: Skin burns

21 EM Radiation: Microwaves Uses: Satellite communication, mobile phone networks, cooking, RADAR. Dangers: Internal tissue heating.

22 Radio waves EM Radiation: Radio waves Uses: Communication and astronomy. Dangers: None

23 EM Questions 1) Match up the following parts of the electromagnetic spectrum with their uses : Gamma rays Radio waves Ultra Violet Visible Microwaves X rays Infra Red Allow us to see Remote Controls See broken bones Carry TV signals RADAR Sterilise equipment Causes sun-tans

24 EM Questions 2) Which radiations are missing from below? Gamma A Ultraviolet Light Infrared B Radio waves X rays Microwaves