SAT Subject Physics Practice Question 138: Answer and Explanation

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Question: 138

1. Which of the following best approximates the energy of a photon whose wavelength is 2.0 nm? (Planck’s constant, h, has a value of 6.6 × 10–34 J • s.)

A. 4 × 10–51 J
B. 1 × 10–34 J
C. 1 × 10–16 J
D. 1 × 1034 J
E. 2 × 10–50 J

Correct Answer: C

Explanation:

Combining the equation E = hf with f = c/ λ gives us

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