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NEET UG PHYSICS MCQ: NUCLEI
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From a newly formed radioactive substance (Half life ), the intensity of radiation is times the permissible safe level. The minimum time after which work can be done safely from this source is
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Correct option: B
Option B () is correct because it takes 6 half-lives for the radiation intensity to reduce to a safe level (64 times to 1 time). Since the half-life is 2 hours, the total time is 6 * 2 = 12 hours.
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