MDCAT Physics MCQ #2555

A nucleus undergoes alpha decay. What is the change in its mass number?

MDCAT Physics MCQ #2555

  1. Question 1

    Q1. A nucleus undergoes alpha decay. What is the change in its mass number?

    • A) -4
    • B) -2
    • C) 0
    • D) +2

    Answer: -4

    Explanation: Alpha decay emits a helium nucleus (2 protons, 2 neutrons), so mass number decreases by 4. Other options are incorrect changes.