MCAT Physics Question 135: Answer and Explanation

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Test Information

Question: 135

15. A nuclide undergoes two alpha decays, two positron decays, and two gamma decays. What is the difference between the atomic number of the parent nuclide and the atomic number of the daughter nuclide?

  • A. 0
  • B. 2
  • C. 4
  • D. 6

Correct Answer: D

Explanation:

In alpha decay, an element loses two protons. In positron decay, a proton is converted into a neutron. Gamma decay has no impact on the atomic number of the nuclide. Therefore, two alpha decays and two positron decays will yield a daughter nuclide with six fewer protons than the parent nuclide.

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