Electromagnetic waves

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All waves are transverse

All waves travel at the same speed in a vacuum

(Highest frequency to lowest frequency):

Gamma rays

X rays

Ultra violet

Light rays

Infra red rays

microwaves

Radio waves

Microwaves can cause internal heating of body tissue

Infra red radiation is felt as heat- causes skin burn

X rays and gamma rays damage cells and cause mutations

Uses of radiation:

Detect smoke

Treat cancer

Gauge the thickness of paper

Sterilise medical equipment