# 6 April, 2017 The EM Spectrum Objectives

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6 April, 2017 The EM Spectrum 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. Keywords Wavelength, lamda, amplitude, frequency, Hertz, kilohertz, megahertz, speed, metres, kilometres.

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.

E-M radiation is basically a movement of energy in the form of a wave. Some examples:

Draw what you see (how can you remember what you see?)
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?)

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?

The Electromagnetic Spectrum
Each type of radiation shown in the electromagnetic spectrum has a different wavelength and a different frequency: High frequency, _____ wavelength Low frequency, _____ (high) wavelength Gamma rays X-rays Ultra violet Visible light Infra red Microwaves Radio/TV γ 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

Randy Monkeys In Velvet Underpants Xterminate Gibbons R M I V U X G
Order of EM Spectrum Randy Monkeys In Velvet Underpants Xterminate Gibbons R M I V U X G Radio Microwaves Infra-red Visible Ultraviolet X-Ray Gamma Your turn – come up with your own

γ BAKER’S “PLAY YOUR EM CARDS RIGHT”
Is the Wavelength Higher or Lower? X-rays Ultra violet Visible light Gamma rays Microwaves Infra red Radio/TV γ TRY AGAIN

γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

γ lower TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

γ lower TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

γ higher TRY AGAIN X-rays Ultra violet Visible light Gamma rays
Microwaves Infra red Radio/TV γ TRY AGAIN

The Electromagnetic Spectrum
The correct order – how can we remember it? Gamma rays X-rays Ultra violet Visible light Infra red Microwaves Radio/TV γ

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