Q .     `A` and `B` are two radioactive substances whose half-lives are `1` and `2` years respectively. Initially `10` g of `A ` and, `1` g of `B` is taken. The time (approximate) after which they will have same quantity remaining is

BITSAT 2007
A

`6.62 ` year

B

`5 ` year

C

`3.2 ` year

D

`7` year

HINT

Use `N = N_0 1/2 ^(t//T_(1/2))`

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