SAT Subject Physics Practice Question 142: Answer and Explanation

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Question: 142

5. What is the de Broglie wavelength of a proton whose linear momentum has a magnitude of 3.3 × 10–23 kg • m/s ?

A. 0.0002 nm
B. 0.002 nm
C. 0.02 nm
D. 0.2 nm
E. 2 nm

Correct Answer: C


The de Broglie wavelength of a particle whose momentum is p is λ= h/p. For this proton, we find that

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