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COMEDK Exam 2020 Solved Paper

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Question : 6

Total: 180

Two radioactive materials X1 and X2 have decay constant 5λ and λ, respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that X2 will be 1∕e after a time

1∕4λ
e∕λ
λ
‌
1
2
λ

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