""^(57)Codecays to ""^(57)Feby beta^(+)- emission. The resulting ""^(57)Feis in its excited state and comes to the ground state by emitting gamma -rays. The half-life beta^(+)-decay is 270 days and that of the gamma -emission is 10^(-8)s . A sample of ""^(57)Cogives 5.0 xx 10^(9)gamma rays per second. How much time will elapse before the emission rate of gamma rays drops to 2.5 xx 10^(9)per second ?

""^(57)Codecays to ""^(57)Feby beta^(+)- emission. The resulting ""^(5

1.	""^(57)Codecays to ""^(57)Feby beta^(+)- emission. The resulting ""^(57)Feis in its excited state and comes to the ground state by emitting gamma -rays. The half-life beta^(+)-decay is 270 days and that of the gamma -emission is 10^(-8)s . A sample of ""^(57)Cogives 5.0 xx 10^(9)gamma rays per second. How much time will elapse before the emission rate of gamma rays drops to 2.5 xx 10^(9)per second ?
Answer» ANSWER :270 DAYS

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