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Questions  

 A radio active element disintegrate for a time interval equal  to its mean life. The fraction that has disintegrated is 

a
1e
b
1-1e
c
0.6933
d
0.69331-1e

detailed solution

Correct option is B

According to radioactive decay law N= N0e-λt   in one mean life  i.e, t=1λ    N= N0e-λ1λ=Noe-1    So amount  disintegrated N0-N0e-1   fraction disintegrated 1-1e

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