From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is
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a
6 hours
b
12 hours
c
64 hours
d
128 hours
answer is B.
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Detailed Solution
After 6 half lives intensity emitted will be safe. =6 x 2 =12 hrs.