MDCAT Physics MCQ #2841

The decay constant of a radioactive substance is 0.05 s^-1. What is its half-life?

MDCAT Physics MCQ #2841

  1. Question 1

    Q1. The decay constant of a radioactive substance is 0.05 s^-1. What is its half-life?

    • A) 13.86 s
    • B) 1.386 s
    • C) 0.1386 s
    • D) 138.6 s

    Answer: 13.86 s

    Explanation: Half-life = ln(2) / λ = 0.693 / 0.05 = 13.86 s. Option 'B' uses wrong value for ln(2).