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The frequencies of X-rays, γ-rays and ultraviolet rays are respectively a, b, and c. Then

1. a < b, b < c
2. a < b, b > c
3. a > b, b > c
4. a > b, b < c

Correct answer: a < b, b > c

Solution

The frequency of γ-rays is higher than that of X-rays, and the frequency of X-rays is higher than that of ultraviolet rays. Thus, a < b and b > c.

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