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The half life of .92^238U undergoing alp...

The half life of `._92^238U` undergoing `alpha`-decay is `4.5xx10^9` years. The activity of 1 g sample of `._92^238U` is

A

`1.23 xx 10^(4) Bq`

B

`2.4 xx 10 ^(5) Bq`

C

`1.82 xx 10 ^(6) Bq`

D

`4.02 xx 10 ^(8) Bq`

Text Solution

Verified by Experts

The correct Answer is:
A
Activity or rate of decay is `R = lamda N` where `lamda = ( 0.693)/(T _(1//2)) and N=No.` of atom is 1 gm of ` ""_(92) ^(238) U = (1 xx 6 0.25 xx 10 ^(23))/(238) = 25.2 xx 10 ^(20) ` atoms, `R= lamda N`
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