JEE Main 2016PhysicsNuclear PhysicsMediumMCQ

JEE Main 2016Nuclear Physics Question with Solution

JEE Main 2016 (03 Apr)

Question

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes, respectively. Initially, the samples have an equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be:

Choose an option

Show full solutionCorrect option: B
Correct answer
B5 : 4
 

Step-by-step explanation

t=80 min=4 TA=2TB

no. of nuclei of A decayed =N0-N024=15N016

no. of nuclei of B decayed =N0-N022=3N04

required ratio =54

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About this question

This is a previous-year question from JEE Main 2016, 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.