Presentation on theme: "6 April, 2017 The EM Spectrum Objectives"— Presentation transcript:
1 6 April, 2017The EM SpectrumObjectivesBe 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.KeywordsWavelength, lamda, amplitude, frequency, Hertz, kilohertz, megahertz, speed, metres, kilometres.
2 OutcomesAll 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.
4 Electromagnetic Radiation E-M radiation is basically a movement of energy in the form of a wave. Some examples:
5 Draw what you see (how can you remember what you see?) Practical TimeDispersion practical.Can you split light up?What do you see?Now watch the demoDraw what you see (how can you remember what you see?)
6 The Electromagnetic Spectrum DemonstrationYour 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 The Electromagnetic Spectrum Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency:High frequency, _____ wavelengthLow frequency, _____ (high) wavelengthGamma raysX-raysUltra violetVisible lightInfra redMicrowavesRadio/TVγEach 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
8 Randy Monkeys In Velvet Underpants Xterminate Gibbons R M I V U X G Order of EM SpectrumRandyMonkeysInVelvetUnderpantsXterminateGibbonsRMIVUXGRadioMicrowavesInfra-redVisibleUltravioletX-RayGammaYour turn – come up with your own
9 γ BAKER’S “PLAY YOUR EM CARDS RIGHT” Is the Wavelength Higher or Lower?X-raysUltra violetVisible lightGamma raysMicrowavesInfra redRadio/TVγTRY AGAIN
10 γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
11 γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
12 γ lower TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
13 γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
14 γ lower TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
15 γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays MicrowavesInfra redRadio/TVγTRY AGAIN
16 The Electromagnetic Spectrum The correct order – how can we remember it?Gamma raysX-raysUltra violetVisible lightInfra redMicrowavesRadio/TVγ