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4 Half life of a radioactive substance A is two times the half life of...

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4 Half life of a radioactive substance A is two times the half life of another radioactive substance B Initially the number of nuclei of A and B are NA and NE respectively After three half lives of A number o nuclei of both are equal Then the ratio NA NB is 5 1 4 c 1 3 b 1 8 d 1 6

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