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Q.

A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is

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a

2.50 gm

b

3.70 gm

c

6.30 gm

d

1.35 gm

answer is D.

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Detailed Solution

M=M0e-λt; given t=21λ M=10e-λ2λ=101e2M=1.35 gm

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A sample of radioactive element has a mass of 10 gm at an instant t = 0.The approximate mass of this element in the sample after two mean lives is