1.

A freshly prepared radioactive source of half -life 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is

Answer»

6 hours
12 hours
24 hours
128 hours

Solution :`N = (N_(0))/(64) = (N_(0))/(2^(6)) :. N = 6` THUS TOTAL time `= 2xx 6 = 12hr`


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