Half lives of two radioactive substances A and Bare 20 hours and 40 hours respectively Initially the sample of A and B have

Question

Half lives of two radioactive substances A and Bare 20 hours and 40 hours respectively Initially the sample of A and B have equal number of nuclei The ratio of remaining number of A to that of B nuclei after 80 hours is 1 2 1 4 1 8

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