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Class 12 NEET Physics Atoms and Nuclei Part 1

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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 (

)2 after a time interval

4λ
2λ
1
2
λ
1
4
λ

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