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

An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years
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  • A 1 N atoms8
  • B 1 N atoms3
  • C 2 N atoms3
  • D 5 N atoms6
  • E 7 N atoms8
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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