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In a sample of radioactive material, wha...

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life ?

A

`69.3%`

B

`64%`

C

`50%`

D

`36%`

Text Solution

Verified by Experts

The correct Answer is:
B
When `t=tau =1/lambda`, then form
`N/N_(0)=e^(-lambdat)=e^(-)=1/e=1/2.72=0.36`.
Fraction decayed `=1-0.36=0.64=64%`
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