SAT Subject Physics Practice Question 381: Answer and Explanation

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Question: 381

2. 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 absorbed energy when theelectron jumps to E-5 from E-3?

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

Correct Answer: B


The correct answer is (B). The solution is found again by using Bohr's equation, ΔE = E3 - E5. The calculation yields -.966 eV. The negative sign tells us the electron absorbs energy as it moves further from the nucleus.

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