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There are 7 types of electromagnetic waves

Radio waves

Microwaves

Infrared

Visible light

Ultra Violet

X rays

Gamma rays

http://www.youtube.com/watch?v=P_PVz8HrrCI (Einbetten)

From beginning to end...

Increasing frequency>decresing wavelength

EM radiation can be harmful to people;

Microwaves- they have a similar frequency to the vibrations of many mocules. Microwaves can heat human body cells. Infrared- Infrared has a higher frequency so carries more energy than microwave radiation, it causes some very nasty skin burns.

Ultra violet- Has got more energy and a higher frequency that infrared radiation. It carries enough energy to knock electrons off atoms. Sunburn happens when surface skin

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