A radio active isotope having a half life of 3 days was received after 9 days. It was found that there was only 4 gms of the isotope in the container. The initial weight of the isotope when packed was

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8 g

64 g

48 g

32 g

answer is D.

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Detailed Solution

n=tt12=93=3;W=W02nW0=2n,W=23(4)=32gm

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