SAT Subject Physics Practice Question 614: Answer and Explanation

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Question: 614

10. This question relates to the electron energy level diagram below. The questions are about a hydrogen electron located at E3.

What is the emission energy when it moves to E2?

A. +66eV
B. +.98eV
C. -1.87eV
D. -10.2eV
E. +12.08eV

Correct Answer: C


The correct answer is (C). The electron emits +1.87eV of energy, which is equal to the difference between E3 - E2. The energy is positive because it is emitted as the electron falls closer to the nucleus.

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