A sample of radioactive element has a ma...

A sample of radioactive element has a mass of `10 g` at an instant `t=0`. The approximate mass of this element in the sample after two mean lives is

A

1.35 gm

B

2.50 gm

C

3.70 gm

D

6.30 gm

Text Solution

Verified by Experts

The correct Answer is:

A

`N=N_0e^(-lambdat) rArr m=m_0e^(-lambdat)=m_0e^(-lambda(2//lambda))`
`10/e^2`=1.35 gm

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