Two radioactive materials A and B have decay constant \[\frac{13}{7}\] – McqOptions

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1.	Two radioactive materials A and B have decay constant \[\frac{13}{7}\] units and \[\frac{19}{14}\] units respectively. Directly both have the same number of nuclei. The time (in same system of units), after which the ratio of their remaining nuclei will be 1/e is
A.	2
B.	3
C.	4
D.	5
Answer» B. 3

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