JEE Main 2024 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 29 January 2024, Shift 1, Physics Q47

Question 47 of 90 in this shift, Physics question 17 of 30, Section A.

The explosive in a Hydrogen bomb is a mixture of

{}_1\mathrm{H}^2

{}_1\mathrm{H}^3

and

{}_3\mathrm{Li}^6

in some condensed form. The chain reaction is given by

{}_3\mathrm{Li}^6+{}_0\mathrm{n}^1\rightarrow{}_2\mathrm{He}^4+{}_1\mathrm{H}^3

{}_1\mathrm{H}^2+{}_1\mathrm{H}^3\rightarrow{}_2\mathrm{He}^4+{}_0\mathrm{n}^1

During the explosion the energy released is approximately [Given : M (Li) = 6.01690 amu, M

({}_1\mathrm{H}^2)

= 2.01471 amu, M

({}_2\mathrm{He}^4)

= 4.00388 amu, and 1 amu = 931.5 MeV]

(1) $12.64$ MeV
(2) $16.48$ MeV
(3) $22.22$ MeVOfficial answer
(4) $28.12$ MeV

Official answer

Option 3

NTA final key.

Chapter: Nuclei
Topic: Fission and Fusion
Idea tested: Mass Defect to MeV Conversion

Same topic in other shifts

All Fission and Fusion questions

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.