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JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 8 April 2026, Shift 2, Physics Q44

Question 44 of 75 in this shift, Physics question 19 of 25, Section A.

Two radioactive substances A and B of mass numbers 200 and 212 respectively, shows spontaneous

\alpha

-decay with same

Q

value of 1 MeV. The ratio of energies of

\alpha

-rays produced by A and B is ________.

(1) $\frac{2548}{2650}$
(2) $\frac{2706}{2646}$
(3) $\frac{2597}{2600}$ Official answer
(4) $\frac{2862}{2499}$

Official answer

Option 3

NTA final key.

Chapter: Nuclei
Topic: Radioactive Decay
Idea tested: Alpha Decay Kinematics and Q-Value

Same idea in other shifts

Asked 2× in all

22 Jul 2021, Shift 2 · Q19A nucleus with mass number 184 initially at rest emits an α-particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic…EasySingle correct

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 108 of the 174 JEE Main shifts held from 2017 to 2026.