Q 1582467337.     The half life for a-decay of uranium `92^ (U)^(228) ` is
`4.47 xx 10^(8)` yr. If a rock contains `60%` of
original `92^ (U)^(228) ` atoms, then its age is

VIT 2015
A

`1.2 xx10^(7) yr`

B

`3.3 xx10^(8) yr`

C

`4.2 xx10^(9) yr`

D

`6.5 xx10^(9) yr`

HINT

`(N)/(N_(0))= (60)/(100) = ((1)/(2))^(n)` `t = nT_(1//2) `

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