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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 26 June 2022, Shift 1, Physics Q48

Question 48 of 90 in this shift, Physics question 18 of 30, Section A.

How many alpha and beta particles are emitted when Uranium 92U238_{92}\mathrm{U}^{238} decays to lead 82Pb206_{82}\mathrm{Pb}^{206} ?
  1. (1)3 alpha particles and 5 beta particles
  2. (2)6 alpha particles and 4 beta particles
  3. (3)4 alpha particles and 5 beta particles
  4. (4)8 alpha particles and 6 beta particlesOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Nuclei
Topic
Radioactive Decay
Idea tested
Counting Alpha and Beta Emissions

Same idea in other shifts

Asked 3× in all
  1. 29 Jun 2022, Shift 2 · Q35In the following nuclear reaction,…EasySingle correct
  2. 4 Aug 2021, Shift 1 · Q4A hypothetical radioactive nuclei decays according to the following series…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.