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[" Radioactive material 'A' has decay constant '8"lambda" and "],[" material 'B' has decay constant "lambda" '.Initially they have "],[" same number of nuclei.After what time,the ratio "],[" of number of nuclei of material 'B' to that 'A' will be "]

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Radioactive material 'A' has decay constant '8 lamda' and material 'B' has decay constant 'lamda'. Initial they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be (1)/( e) ?

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