The decay constant of a radioactive substance is 0.05 min^-1. What is its half-life?
Q1. The decay constant of a radioactive substance is 0.05 min^-1. What is its half-life?
Answer: 13.86 min
Explanation: Half-life = ln(2)/λ = 0.693/0.05 = 13.86 min. Other options miscalculate or use wrong units.