Atomic StructureHard
Question
freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times of the permissible safe level. The minimum time after which it would be possible work safely with this source is
Options
A.6 h
B.12 h
C.24 h
D.128 h
Solution
From R = R0 
we have, 1 = 64
or n = 6 = number of half-lives
∴ t = n × t1/2 = 6 × 2 = 12 h
we have, 1 = 64
or n = 6 = number of half-lives
∴ t = n × t1/2 = 6 × 2 = 12 h
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