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6.6 Electromagnetic Waves 2 January 2014 Think about: How well behaved you are How good you are at science How much you like chocolate hob nobs.

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Presentation on theme: "6.6 Electromagnetic Waves 2 January 2014 Think about: How well behaved you are How good you are at science How much you like chocolate hob nobs."— Presentation transcript:

1 6.6 Electromagnetic Waves 2 January 2014 Think about: How well behaved you are How good you are at science How much you like chocolate hob nobs

2 Aims Describe visible light as part of the electromagnetic spectrum State other types of radiation

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8 Electromagnetic waves

9 Travel through empty space

10 Travel at km/s

11 Transverse waves

12 They transfer energy

13 Light vs Sound Example of wave LIGHTSOUND Type of wave Speed in air / km/s Material of medium

14 Light vs Sound Example of wave LIGHTSOUND Type of waveTransverseLongitudinal Speed in air / km/s Material of medium No material required Solid, liquid, gas

15 Example of wave LIGHTSOUND Type of wave Speed in air / km/s Material of medium Example of wave LIGHTSOUND Type of wave Speed in air / km/s Material of medium

16 Electromagnetic radiation actually comes in packets or lumps. I call these packets quanta. A quanta of light is called a photon. Nobel prize please…

17 The higher the frequency, the more energy the photon has

18 Intensity Energy of each photon Number of photons arriving each second

19 The electromagnetic spectrum

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23 Radio waves

24 Communications: TV, mobile phones, local radio, police

25 Microwaves

26 Microwaves ovens, communicating with satellites, RADAR

27 Infrared

28 Infra-red Search and rescue teams, detect circulation problems, (cancer, arthritis), astronomy, burglar alarms

29 Light

30 Ultraviolet

31 UV Produce vitamin D in our skin, suntan, skin cancer

32 X-rays

33 X-rays (bones, teeth), check welds and joints, food

34 Gamma rays

35 Make Hulks, sterilise food and utensils, tracers, radiotherapy

36 RECALL THE DETRIMENTAL EFFECTS OF EXCESSIVE EXPOSURE OF THE HUMAN BODY TO ELECTROMAGNETIC WAVES 3.13

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42 Make an EM spectrum booklet Guest starring Mr. Simon Porter

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59 The EM spectrum You now have seven sections to fill in with information regarding the seven types of electromagnetic radiation Include uses, dangers, detectors, examples and origins if you can The better you make it the better it will help your revision


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