JEE Main 2021 · PhysicsMultiple choiceSingle correctMediumCalculation

JEE Main 26 February 2021, Shift 2, Physics Q14

Question 14 of 90 in this shift, Physics question 14 of 30, Section A.

The recoil speed of a hydrogen atom after it emits a photon in going from n = 5 state to n = 1 state will be :

(1)4.34 m/s
(2)4.17 m/sOfficial answer
(3)3.25 m/s
(4)2.19 m/s

Official answer

Option 2

NTA final key.

Chapter: Atoms
Topic: Bohr's Atomic Model
Idea tested: Atom Recoil During Emission

Same idea in other shifts

Asked 3× in all

4 Apr 2024, Shift 1 · Q60A hydrogen atom changes its state from n = 3 to n = 2. Due to recoil, the percentage change in the wave length of emitted light is…HardNumerical value
29 Jan 2024, Shift 1 · Q60When a hydrogen atom going from $n$ =2 to $n$ =1 emits a photon, its recoil speed is $\frac{x}{5}\ m/s$ . Where $x$ = ______. (Use, mass of…MediumNumerical value

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.