Two radioactive materials X1 and X2 have decay constants 10λ and λ, respectively. If initially they have the same number of nuclei, the ratio of the number of nuclei of X1 to that of X2 be 1/e after a time
111λ
110λ
1110λ
19λ
A
19λ
B
110λ
C
111λ
D
1110λ
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Solution
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Considering first order decay process, and same no. of initial no. of atoms: X1=Noe−10λt X2=Noe−λt X1X2=e−10λte−λt X1X2=e−9λt
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