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.