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A sample contains 10^(-2)kg each of two ...

A sample contains `10^(-2)kg` each of two substances A and B with half lives 4 sec and 8 sec respectively. Their atomic weights are in the ratio `1:2`. Find the amounts of A and B after an interval of 16 seconds.

A

`A = 0.625 xx 10^(-4) kg, B = 0.25 xx 10^(-3) kg`

B

`A = 0.25 xx 10^(-3) kg, B = 0.625 xx 10^(-4) kg`

C

`A = 2.5 xx 10^(-3) kg, B = 6.25 xx 10^(-4) kg`

D

`A = 6.25 xx 10^(-3) kg, B = 2.5 xx 10^(-3) kg`

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The correct Answer is:
D
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