NEET 2020 Model Question Paper 4

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Question : 127 of 180
 
Marks: +1, -0
Two radioactive substances A and B have decay constants 5λ and λ respectively. At t = 0 they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be (
1
e
)
2
after a time interval
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