JEE Main 2022PhysicsNuclear PhysicsEasyMCQ

JEE Main 2022Nuclear Physics Question with Solution

JEE Main 2022 (28 Jul Shift 1)

Question

The half life period of a radioactive substance is 60 days. The time taken for 78 th of its original mass to disintegrate will be :

Choose an option

Show full solutionCorrect option: C
Correct answer
C180 days

Step-by-step explanation

Given half life period of a radioactive substance is t12=60 days.

Here, 78th of radioactive substance disintegrates means 18th remains or 123.

  3 half lives =3×60=180 days 

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About this question

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.