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A radioactive element has a decay constant of 0.077s-1, calculate its half life

Physics
WAEC 2003
A radioactive element has a decay constant of 0.077s-1, calculate its half life
  • A. 12.5s
  • B. 9.0s
  • C. 5.1s
  • D. 0.5s
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Correct Answer: Option B
Explanation
T = \(\frac{0.692}{\lambda} = \frac{0.692}{0.077}\)

= 9s
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