Two radioactive material X1 and X2 have decay constant 10λ and λ respectively. Initially, they have the same number of nuclei. The ratio of the number of nuclei X1 to that of X2 will be 1e after time,
A
110λ
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B
111λ
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C
1100λ
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D
19λ
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Solution
The correct option is D19λ
For X1, N1=N0e−λ1t
For X2, N2=N0e−λ2t
Here, λ1=10λ, λ2=λ