8 The Spectrum

The Electro-magnetic Spectrum

Radio & TV	Microwaves	Infra Red	Visible	X-rays	Gamma rays
These waves have a long wavelength and a low frequency	Microwaves are used in cooking and satellite communications	We feel Infra Red radiation as heat	A rainbow is one example of the visible part of the spectrum	X-rays are used to view bones and other body structures	These dangerous waves have a short wavelength and a high frequency

Radio and television waves have a long wavelength and a low frequency ... they are quite safe to us. The higher the frequency of a wave, however, the more dangerous it becomes. Gamma rays, for example, are very dangerous to humans.
Light is made up of colours which each have a different wavelength. Red light has a longer wavelength than blue light.

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Now answer these questions

1. What has the longest wavelength ? - radio waves light waves gamma radiation
2. What has the shortest wavelength ? - radio waves light waves gamma radiation
3. Which part of the spectrum can we see ? - radio waves light waves gamma radiation
4. Which of these has the longest wavelength ? - light waves microwaves x-rays
5. Which of these is the most dangerous ? - light waves microwaves x-rays
6. Which colour has the longest wavelength ? - red green blue
7. Which colour has the shortest wavelength ? - red green blue

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