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1 of 6© Boardworks Ltd 2006 The EM Spectrum 25 August, 2014 Objectives Be able to describe the order of the em- spectrum and know how fast light travels. HSW: AF5: Process data using multi-step calculations to identify complex relationships between variables. Used before in: Will use again in: PLTS: Independent enquirers: support conclusions, using reasoned arguments and evidence. Used before in:Will use again in: Keywords Wavelength, lamda, amplitude, frequency, Hertz, kilohertz, megahertz, speed, metres, kilometres.
2 of 6© Boardworks Ltd 2006 Outcomes All students should be able to: Describe that there are different types of visible and invisible light each with different properties. Most students should be able to: State the speed of light. Some students should be able to: Explain that the em-spectrum can be described in different sections because of different wavelengths and frequencies and that this effects how much energy the light has.
3 of 6© Boardworks Ltd 2006
4 of 6© Boardworks Ltd 2006 Electromagnetic Radiation E-M radiation is basically a movement of energy in the form of a wave. Some examples:
5 of 6© Boardworks Ltd 2006 Practical Time Dispersion practical. Can you split light up? What do you see? Now watch the demo Draw what you see (how can you remember what you see?)
6 of 6© Boardworks Ltd 2006 The Electromagnetic Spectrum Demonstration Your teacher will show you the EM- Spectrum and describe the sections. How do we know they are all there? Why aren’t there any more than this?
7 of 6© Boardworks Ltd 2006 The Electromagnetic Spectrum Gamma rays X-raysUltra violetVisible light Infra redMicrowavesRadio/TV Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency: Each of these types travels at the same speed through a _______ (300,000,000m/s), and different wavelengths are absorbed by different surfaces (e.g. infra red is absorbed very well by ___________ surfaces). This absorption may heat the material up (like infra red and _______) or cause an alternating current (like in a __ _______). Words – black, microwaves, long, short, TV aerial, vacuum High frequency, _____ wavelength Low frequency, _____ (high) wavelength γ
8 of 6© Boardworks Ltd 2006 Order of EM Spectrum R M I V U X G Randy Monkeys In Velvet Underpants Xterminate Gibbons Radio Microwaves Infra-red Visible Ultraviolet X-Ray Gamma Your turn – come up with your own
9 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ BAKER’SBAKER’S “PLAY YOUR EM CARDS RIGHT” TRY AGAIN Is the Wavelength Higher or Lower?
10 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN higher
11 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN higher
12 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN lower
13 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN higher
14 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN lower
15 of 6© Boardworks Ltd 2006 X-raysUltra violetVisible light Gamma rays MicrowavesInfra redRadio/TV γ TRY AGAIN higher
16 of 6© Boardworks Ltd 2006 The Electromagnetic Spectrum Gamma rays X-raysUltra violetVisible light Infra redMicrowavesRadio/TV γ The correct order – how can we remember it?
17 of 6© Boardworks Ltd 2006 Hotseat
Quiz Electromagnetic spectrum. Using the quiz … Click through the quiz to see the questions and answers. Remember it is MUCH better to try to think of.
© Boardworks Ltd 2003 KS4 Waves : Dispersion and Electromagnetic radiation.
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