The electromagnetic spectrum

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Radiowaves

Used for transmitting TV programmes

wavelength = 1m to 3 x 10^3m

(wavelength = 1m to 0.003m)

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Microwaves

Used for transmitting phone calls and for cooking.

wavelength = 10^-3m to 1m

(wavelength = 0.001m to 1m)

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Infrared

Detected by skin, used for communication in optical fibres.

wavelength = 4 x 10 -7m to 4 x 10 -3m

(wavelength = 0.0000004m to 0.003m)

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Visible light

Detected by eyes and cameras

wavelength = 7 x 10 -7m to 4 x 10 -7m

(wavelength = 0.0000007m to 0.0000004m)

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Ultraviolet

Causes suntans and may cause skin cancer

wavelength = 10 -9m to 7 x 10 -7m

(wavelength = 0.000000001m to 0.0000007m)

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X-rays

Detected by photographic films and special cameras. These can go through some materials and may cause cancer.

wavelength = 10 -10m to 10 -9m

(wavelength = 0.0000000001m to 0.000000001m)

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Gamma rays

Detected by photographic films and special cameras, they can go though some materials and can cause cancer.

wavelength = 10 -11m to 10 -10m

(wavelength = 0.00000000001m to 0.0000000001m)

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