SAT Subject Physics Practice Question 198: Answer and Explanation

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Question: 198

44.

Identify the particle X resulting from the nuclear reaction shown above.

A. Positron
B. Electron
C. Proton
D. Neutron
E. Alpha particle

Correct Answer: D

Explanation:

To balance the superscripts, we write 2 + 2 = 3 + A, and get A = 1. Now, to balance the subscripts, we write 1 + 1 = 2 + Z, so Z = 0. Therefore, the particle X has a mass number of 1 and a charge of 0; it’s a neutron.

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