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

A radioactive element has a decay constant of 0.077s-1, calculate its half life
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  • A 12.5s
  • B 9.0s
  • C 5.1s
  • D 0.5s
Correct Answer: Option B
Explanation:
T = \(\frac{0.692}{\lambda} = \frac{0.692}{0.077}\)
= 9s

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