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Heavy Water

The radioacti...

Question

The radioactive isotope ( $T_{\frac{1}{2}}$ = 3days) sample was received after 12 days. It was found that 3g of the isotope is present in the sample. The initial weight of the isotope when packed is ___

A

12g

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B

24g

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C

36g

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D

48g

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Solution

The correct option is D 48g
Radiodecay is a first order reaction and hence the half life remains constant. Thus 48g of the sample will reduce to 3g after 4 half lives.

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