Radioactive material 'A' has decay constant '8 ????' and material
'B' has decay constant '????'. Initially 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 ? [2017]
(a) 1/7???? (b) 1/8????
(c) 1/9???? (d)1/????
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(a) 1/7????
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