Electromagnetic spectrum

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10 Terms

1
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Why does violet light bend more than red in glass?

Because it slows down more and changes speed most.

2
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What law does reflection follow?

Angle in = angle out.

3
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Why is ultrasound safer than X-rays?

It doesn’t harm cells.

4
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What happens to wave speed in the body?

It gets slower.

5
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What happens to wave frequency in the body?

It stays the same.

6
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How does a red filter work?

It blocks all colours except red.

7
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Why does a red wall look black under green light?

No red light hits it, so nothing reflects.

8
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What kind of waves can cause cancer?

UV, X-rays, gamma rays.

9
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Why use high voltage in power lines?

It wastes less energy.

10
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What is the same for all EM waves in space?

Their speed.