A radioactive element has a decay constant of 0.077s-1. Calculate its half-life

Physics WAEC 2008

A radioactive element has a decay constant of 0.077s-1. Calculate its half-life

  • 13.0s
  • 9.0s checkmark
  • 5.1s
  • 0.5s

The correct answer is: B

Explanation

\(t_{\frac{1}{2}} = \frac{0.693}{\lambda} = \frac{0.693}{0.077} = 9s\)
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