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Saturday, 31 October

JEE Main 2023 · PhysicsNumerical answerNumerical valueMediumCalculation

JEE Main 15 April 2023, Shift 1, Physics Q56

Question 56 of 90 in this shift, Physics question 26 of 30, Section B.

As per given figure A, B and C are the first, second and third excited energy levels of hydrogen atom respectively. If the ratio of the two wavelengths (i.e. λ1λ2\frac{\lambda_1}{\lambda_2}) is 74n\frac{7}{4n}, then the value of nn will be ______________.

The figure, in words

Energy level diagram with three horizontal levels, from bottom to top A, B, C. An arrow from B down to A is labelled λ1\lambda_1; an arrow from C down to B is labelled λ2\lambda_2.

Official answer

5

NTA final key.

Chapter
Atoms
Topic
Bohr's Atomic Model
Idea tested
Rydberg Formula and Spectra

Same idea in other shifts

Asked 10× in all
  1. 5 Apr 2026, Shift 1 · Q36In the hydrogen atom, the electron makes a transition from the higher orbit (ii) to a lower orbit (ff). The ratio of the radius of the…EasySingle correct
  2. 31 Jan 2024, Shift 1 · Q47If the wavelength of the first member of Lyman series of hydrogen is λ\lambda. The wavelength of the second member will beEasySingle correct
  3. 25 Jul 2022, Shift 2 · Q50Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength λ\lambda . The value of principal quantum…MediumSingle correct
  4. 25 Jul 2022, Shift 2 · Q54xx+4\frac{x}{x+4} is the ratio of energies of photons produced due to transition of an electron of hydrogen atom from its (i) third…EasyNumerical value
  5. 26 Jul 2022, Shift 1 · Q59In the hydrogen spectrum, λ\lambda be the wavelength of first transition line of Lyman series. The wavelength difference will be…MediumNumerical value
  6. 26 Aug 2021, Shift 1 · Q5A particular hydrogen like ion emits radiation of frequency 2.92×10152.92\times10^{15} Hz when it makes transition from n=3 to n=1. The frequency…EasySingle correct
  7. 25 Feb 2021, Shift 2 · Q16The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is :EasySingle correct
  8. 26 Feb 2021, Shift 1 · Q19If λ1\lambda_1 and λ2\lambda_2 are the wavelengths of the third member of Lyman and first member of the Paschen series respectively, then…MediumSingle 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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.