SAT Subject Physics Practice Question 577: Answer and Explanation

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Question: 577

3. When U-235 is fissioned in a nuclear reactor, the nuclear reaction is maintained by

A. heat produced in the reactor.
B. the moderator rods.
C. radioactive decay products.
D. vibrations induced in the U-235.
E. neutrons produced in the reaction.

Correct Answer: E

Explanation:

The correct answer is (E). A chain reaction (industrial fission is a chain reaction) continues because of the neutrons that are emitted in the fissioning of each U-235 atom.

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