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  • The half life of is 8 days. Given a sample of <img alt="131 \mathrm{~I}" src="https://e

The half life of 131 \mathrm{~I} is 8 days. Given a sample of 131 \mathrm{~I} at time \mathrm{ t=0}, we can assert that -
 

Option: 1

no nucleus will decay. before t=4 days.
 


Option: 2

 no. nucleus will decay before t=8 days.
 


Option: 3

no. nucleus will decay before t=16 days
 


Option: 4

 a given nucleus may decay at any time after t=0


Answers (1)

best_answer

Number of nuclei decreases exponentially
\mathrm{N=N_0 e^{-\lambda t} }

and rate of decay \mathrm{ \left(-\frac{d N}{d t}\right)=\lambda N }

He decay process lasts upto \mathrm{t=\infty }. Therefore a given nucleus may decay at any time after \mathrm{t=0 }

Posted by

Ritika Harsh

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