Nuclear Physics and RadioactivityHard
Question
From a newly formed radioactive substance (Half life 2 hours), the intensity of ratiation is 128 times the permissible safe level. The minimum time after which work can be done safely from this source is -
Options
A.6 hours
B.14 hours
C.24 hours
D.128 hours
Solution
⇒ n = 7After 7 half lives intensity emitted will be safe
∴ Total time taken = 7 × 2 = 14 hrs.
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