23. The mean lives of a radioactive substance are
2000 years and 400 years for a and ß emission
respectively. What will be the time (in years) after
which 5/6th of the given sample will decay if it is
decaying by both a and B emission together?
[In 6 = 1.79]
(1) 297
(2) 397
(3) 597
(4) 533
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