The half life of ""(92)^(238)U undergoin...

The half life of `""_(92)^(238)U` undergoing `alpha` decay is `4.5 xx 10^9` years what is the activity of 1g. Sample of `""_(92)^(238)U`.

A

`9.0 xx 10^9` years

B

`13.5 xx 10^9` years

C

`4.5 xx 10^9` years

D

`4.5 xx 10^(4.5)` years

Verified by Experts

The correct Answer is:

C

because `t_(1//2) = 45xx10^9` years , so after` 4.5xx10^9` years the amount of `""_(92)U^(238)` will be half decayed

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