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A 10 g sample of radioactive sample is p...

A 10 g sample of radioactive sample is present at t= 0. The approximate mass of this element in the sample after two mean life is :

A

1.35 g

B

2.50 g

C

3.70 g

D

6.30 g

Text Solution

Verified by Experts

The correct Answer is:
A
mean life ` = (1)/(lambda), N = N_(0)e^(-lambdat) = N_(0)e^((-2lambda)/(lambda)) = N_(0)e^(-2) " " thereforeN =10 xx 0.135 xx 1.35` g
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