InterviewSolution
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InterviewSolution
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A sample of a radioactive element has a mass of 10 g at an instant t=0. The approximate mass of this element in the sample left after two mean lives isA. 1.35 gB. 2.50 gC. 3.70 gD. 6.30 g |
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Answer» Correct Answer - a Here, t=2 `tau=2xx1.44 T_(1//2)=2.88 T_(1//2)` As `N/N_0=m/m_0=(1/2)^(t//T_(1//2))=(1/2)^(2.88)` `therefore m=m_0(1/2)^(2.88)=10(1/2)^2.88 ` g =10 x 0.1358 g = 1.358 g |
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