SAT Subject Physics Practice Question 325: Answer and Explanation
21. A hydrogen electron gains enough energy to rise from the n=1 to the n=5 energy level. How much energy does it gain?
A. +.88 eV
B. +2.54 eV
C. +10.21 eV
D. +12.09 eV
E. +12.75 eV
Correct Answer: E
The correct answer is (E). The hydrogen must gain 12.75eV of energy to be raised to the n = 5 level, where its potential is .85eV.