SAT Subject Physics Practice Question 380: Answer and Explanation

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Question: 380

1. Question below relates to the following chart, which is a partial energy level diagram for the hydrogen electron.

The question relates to a hydrogen electron located at E-3. What is the emission energy when theelectron falls to E-2 from E-3?

A. ±.66eV
B. ±.966eV
C. ±1.89eV
D. ±10.2eV
E. ±12.09eV

Correct Answer: C


The correct answer is (C). The solution to the problem is found by ΔE = E3 - E2. The calculation yields +1.89 eV. The positive sign tells us the electron releases energy as it falls to a lower energy level.

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