JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 9 January 2020, Shift 1, Chemistry Q26

Question 26 of 75 in this shift, Chemistry question 1 of 25, Section A.

The de Broglie wavelength of an electron in the

4^{\mathrm{th}}

Bohr orbit is :

(1) $4\pi a_0$
(2) $8\pi a_0$ Official answer
(3) $6\pi a_0$
(4) $2\pi a_0$

Official answer

Option 2

NTA final key (Jan 2020).

Chapter: Structure of Atom
Topic: Bohr's Atomic Theory
Idea tested: Angular Momentum Quantization

Same idea in other shifts

Asked 3× in all

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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.