SAT Subject Physics Practice Question 118: Answer and Explanation

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Question: 118

1. What is the wavelength of an X-ray whose frequency is 1.0 × 1018 Hz?

A. 3.3 × 10–11 m
B. 3.0 × 10–10 m
C. 3.3 × 10–9 m
D. 3.0 × 10–8 m
E. 3.0 × 1026 m

Correct Answer: B

Explanation:

From the equation λf = c, we find that

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