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Radiocarbon Dating

200gms of a s...

Question

$200$ gms of a sample of Radioisotope has undergoes decay process. The amount of sample left over after III Half life period is.

A

25

g

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B

12.5

g

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C

100

g

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D

50

g

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Solution

The correct option is A $25$ g
A
$200 g m s \to 1^{s t} h a l f l i f e 100 g m s \to 2^{n d} h a l f l i f e 50 g m s \to 3^{r d} h a l f l i f e 25 g m s$
$25 g m s$ of sample are left over after $3^{r d}$ half life period.

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