a freshly prepared radioactive source of half life 2 h emits radiation 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
Dear Student,
Please find below the solution to the asked query:
According to the law of radioactivity,
Where,
N = intensity of radiation at any time.
N0 = intensity of radiation at time t = 0 sec.
Given that,
and . Therefore, Let after a time t, the intensity of radiation reaches the safe level. Then,
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