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The isotopes .^(238)U and .^(235)U occur...

The isotopes `.^(238)U` and `.^(235)U` occur in nature in the mass ratio 140 : 1. it is assumed that intially they were found in equal mass. If half life `(t_(1//2))` of `.^(238)U=4.5xx10^(9)` and `t_(1//2)` of `.^(235)U = 7.13xx10^(8)` years respectively then the age of earth is `(log 7=0.846,log2=0.3)`

A

`6.04xx10^(9)` year

B

`2.01xx10^(9)` year

C

`8.72xx10^(9)` year

D

none of these

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The correct Answer is:
A
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