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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyApplication

JEE Main 25 July 2021, Shift 1, Physics Q7

Question 7 of 90 in this shift, Physics question 7 of 30, Section A.

A particle of mass 4M at rest disintegrates into two particles of mass M and 3M respectively having non zero velocities. The ratio of de-Broglie wavelength of particle of mass M to that of mass 3M will be :
  1. (1)1:11:1Official answer
  2. (2)1:31:3
  3. (3)3:13:1
  4. (4)1:31:\sqrt{3}

Official answer

Option 1

NTA final key.

Chapter
Dual Nature of Radiation and Matter
Topic
Matter Waves
Idea tested
Wavelengths in Radioactive Decay

Same idea in other shifts

Asked 2× in all
  1. 26 Jul 2022, Shift 2 · Q40A nucleus of mass M at rest splits into two parts having masses M′3\frac{M'}{3} and 2M′3\frac{2M'}{3} (M′<M)(M' < M). The ratio of de Broglie…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.