JEE Main 2020PhysicsNuclear PhysicsMediumMCQ

JEE Main 2020Nuclear Physics Question with Solution

JEE Main 2020 (03 Sep Shift 1)

Question

In a radioactive material, a fraction of active material remaining after the time t is 916 . The fraction that was remaining after the time t2 is :

Choose an option

Show full solutionCorrect option: C
Correct answer
C34

Step-by-step explanation

N=N0e-λt  ...1

N'=N0e-λt2.2

from (1) & (2)

N'N0=NN012=91612=34.

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About this question

This is a previous-year question from JEE Main 2020, 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.