JEE Main 2021 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 3 August 2021, Shift 2, Physics Q23

Question 23 of 90 in this shift, Physics question 23 of 30, Section B.

The ratio of shortest wavelength to the largest wavelength in Brackett series of atomic spectra for hydrogen atom is

x : 25

, where the value of

x

\underline{\hspace{2em}}

Official answer

NTA final key.

Chapter: Atoms
Topic: Bohr's Atomic Model
Idea tested: Shortest and Longest Wavelengths

Same idea in other shifts

Asked 3× in all

7 Apr 2025, Shift 1 · Q43For a hydrogen atom, the ratio of the largest wavelength of Lyman series to that of the Balmer series isEasySingle correct
6 Apr 2024, Shift 2 · Q48The longest wavelength associated with Paschen series is : (Given $R_H=1.097\times10^7$ SI unit)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 42 of the 174 JEE Main shifts held from 2017 to 2026.