JEE Main 2022 — Nuclear Physics Question with Solution
JEE Main 2022 (28 Jul Shift 1)
Question
A freshly prepared radioactive source of half life hours minutes emits radiation which is times the permissible safe level. The minimum time, after which it would be possible to work safely with source, will be _____ hours.
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Show full solutionCorrect answer: 15
Correct answer
15
Step-by-step explanation
Given here, minutes,
, where, is the safe limit.
Using radioactive decay law relation, , where, is the minimum time in hours after which it would be possible to work safely with source.
Putting the values, we have
hours
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This is a previous-year question from JEE Main 2022, covering the Nuclear Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.