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An element whose half-life is 3 years has N atoms. How many atoms would have...

Physics
WAEC 1992
An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
  • A. 1 N atoms8              
  • B. 1 N atoms3              
  • C. 2 N atoms3              
  • D. 5 N atoms6              
  • E. 7 N atoms8              
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Correct Answer: Option E
Explanation
\(\frac{N}{3}\) = 3years

\(\frac{N}{4}\) = 6years

\(\frac{N}{8}\) = 9years

N - \(\frac{N}{8}\) = \(\frac{7N}{8}\)
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