7.4 Electromagnetic spectrum

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7 Terms

1
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What type of waves are all EM waves?

All electromagnetic waves are transverse waves that travel with the same speed c in free space.

2
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State the speed of EM waves in a vacuum.

c = 3.0×108 m/s.

3
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State the wavelength ranges of the EM spectrum.

Radio waves: > 10-1m.
Microwaves: 10-1 to 10-3m.

Infrared: 10-3 to 7×10-7m.
Visible light: 7×10-7 to 4×10-7m.
Ultraviolet: 4×10-7 to 10-8m.
X-rays: 10-8 to 10-11m.
Gamma rays: < 10-11m.

4
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How does frequency affect energy in EM radiation?

The higher the frequency, the higher the energy of the radiation.

5
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What are the effects of high-energy radiation?

Highly ionising, harmful to cells and tissue, and can cause cancer.

6
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What are the uses/effects of low-energy radiation?

Useful for communications and less harmful to humans.

7
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State the visible wavelength range.

400 nm to 700 nm in free space.