SAT Subject Physics Practice Question 235: Answer and Explanation

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Question: 235

6. Which type of decay would cause the number of neutrons in the nucleus to decrease by 1 ?

A. Alpha decay
B. β decay
C. β+ decay
D. Electron capture
E. Gamma decay

Correct Answer: B

Explanation:

When a nucleus undergoes β decay, a neutron is converted into a proton and an electron, and the electron is ejected. Because of this, the number of neutrons in the nucleus is decreased by 1.

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