MDCAT Physics MCQ #2862

A ¹⁴C sample has 25% of its original activity. How many half-lives have passed?

MDCAT Physics MCQ #2862

  1. Question 1

    Q1. A ¹⁴C sample has 25% of its original activity. How many half-lives have passed?

    • A) 2
    • B) 3
    • C) 4
    • D) 1

    Answer: 2

    Explanation: Activity halves per half-life. 25% = (1/2)² = 2 half-lives. Option B miscalculates as three.