A) \[\left( \frac{n}{N}s \right)\]
B) \[\left( \frac{N}{n} \right)s\]
C) \[\frac{0.693N}{n}s\]
D) \[\frac{0.693n}{N}s\]
Correct Answer: C
Solution :
The decay rate \[R\] of a radioactive element is the number of decays per second. \[n=R=\lambda N\] where\[\lambda =\]decay constant \[=\frac{0.693}{half-life}=\frac{0.693}{T}\] \[\therefore \] \[n=\frac{0.693}{T}N\] or \[T=\frac{0.693}{n}s\]
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