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JAMB Physics 2009 Question 46

Question 46

Radioactivity and Nuclear Physics

If the decay constant of a radioactive substance is 0.231s−1, the half-life is

  1. A.3.00s.
  2. B.0.12s.
  3. C.0.33s.
  4. D.1.50s.
Show the answer and explanation

Answer: A (3.00s.)

Explanation

T½ = 0.693/λ = 0.693 ÷ 0.231 = 3.00 s.