NEET Physics Nuclei Questions Solved


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 
(a) 2.50 gm             (b) 3.70 gm
(c) 6.30 gm             (d) 1.35 gm

(d) M=M0e-λt ; given t=21λ

M=10e-λ2λ=101e2M=1.35 gm

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