SAT Subject Physics Practice Question 454: Answer and Explanation

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Question: 454

15. The three natural radiations, in order from most penetrating to least penetrating, are

A. alpha, beta, and gamma.
B. beta, gamma, and alpha.
C. gamma, alpha, and beta.
D. gamma, beta, and alpha.
E. beta, alpha, and gamma.

Correct Answer: D


The correct answer is (D). The penetrating capability of radiation is based upon its energy. Gamma radiation is most energetic followed by beta then alpha.

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