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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
  • A. 13.0s
  • B. 9.0s
  • C. 5.1s
  • D. 0.5s
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Correct Answer: Option B
Explanation
\(t_{\frac{1}{2}} = \frac{0.693}{\lambda} = \frac{0.693}{0.077} = 9s\)
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