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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 9 January 2020, Shift 2, Physics Q19

Question 19 of 75 in this shift, Physics question 19 of 25, Section A.

The energy required to ionise a hydrogen like ion in its ground state is 9 Rydbergs. What is the wavelength of the radiation emitted when the electron in this ion jumps from the second excited state to the ground state ?
  1. (1)11.4 nmOfficial answer
  2. (2)24.2 nm
  3. (3)8.6 nm
  4. (4)35.8 nm

Official answer

Option 1

NTA final key (Jan 2020).

Chapter
Atoms
Topic
Bohr's Atomic Model
Idea tested
Identifying Atomic Number from Spectra

Same idea in other shifts

Asked 2× in all
  1. 1 Feb 2024, Shift 2 · Q60A particular hydrogen - like ion emits the radiation of frequency 3×10153\times10^{15} Hz when it makes transition from n = 2 to n = 1. The…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.