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Two radioactive substances A and B have decay constants 52 and respectively. At t=0 they have the same number of nuclei. The ratio of

Two radioactive substances A and B have decay constants 52 and 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) after a time interval (a) 42 (b) 22 (c) 1/2(d) 1/42

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