SAT Subject Physics Practice Question 637: Answer and Explanation

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Question: 637

3. When blue light is shined onto a certain metal, no electrons are ejected. Which of the following lights might eject electrons from the metal?

A. Red
B. Yellow
C. Green
D. Infrared
E. Ultraviolet

Correct Answer: E

Explanation:

The correct answer is (E). Of the choices listed, the only electromagnetic radiation that carries more energy than the blue light is ultraviolet.

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