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JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyRecall

JEE Main 17 March 2021, Shift 1, Physics Q20

Question 20 of 90 in this shift, Physics question 20 of 30, Section A.

If an electron is moving in the n

^{th}

orbit of the hydrogen atom, then its velocity (

v_n

) for the n

^{th}

orbit is given as :

(1) $v_n\propto n^2$
(2) $v_n\propto n$
(3) $v_n\propto\frac{1}{n^2}$
(4) $v_n\propto\frac{1}{n}$ Official answer

Official answer

Option 4

NTA final key.

Chapter: Atoms
Topic: Bohr's Atomic Model
Idea tested: Electron Velocity in Orbit

Same idea in other shifts

Asked 2× in all

25 Jun 2022, Shift 1 · Q46The ratio for the speed of the electron in the $3^{rd}$ orbit of $\mathrm{He^+}$ to the speed of the electron in the $3^{rd}$ orbit of…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.