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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumDiagram reading

JEE Main 24 February 2021, Shift 1, Physics Q17

Question 17 of 90 in this shift, Physics question 17 of 30, Section A.

In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked A, B, C, D and E. The transitions A, B and C respectively represent :

The figure, in words

Energy level diagram: a shaded box labelled Continuum at the top (+eV above, 0 eV at its lower edge), then horizontal levels n=5 (−0.54 eV), n=4 (−0.85 eV), n=3 (−1.51 eV), n=2 (−3.4 eV), n=1 (−13.6 eV). Downward arrows: A from the Continuum/0 eV edge to n=1; B from n=5 to n=2; C from n=5 to n=3; D from n=4 to n=2; E from inside the Continuum box to n=1.
  1. (1)The first member of the Lyman series, third member of Balmer series and second member of Paschen series.
  2. (2)The ionization potential of hydrogen, second member of Balmer series and third member of Paschen series.
  3. (3)The series limit of Lyman series, second member of Balmer series and second member of Paschen series.
  4. (4)The series limit of Lyman series, third member of Balmer series and second member of Paschen series.Official answer

Official answer

Option 4

NTA final key.

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

Same idea in other shifts

Asked 8× in all
  1. 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
  2. 5 Apr 2024, Shift 2 · Q60The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is 915 A˚\mathrm{\AA}. The longest wavelength of…MediumNumerical value
  3. 6 Apr 2024, Shift 1 · Q48The ratio of the shortest wavelength of Balmer series to the shortest wavelength of Lyman series for hydrogen atom is :EasySingle correct
  4. 6 Apr 2024, Shift 2 · Q48The longest wavelength associated with Paschen series is : (Given RH=1.097×107R_H=1.097\times10^7 SI unit)EasySingle correct
  5. 10 Apr 2023, Shift 2 · Q56If 917 A˚\mathrm{\AA} be the lowest wavelength of Lyman series then the lowest wavelength of Balmer series will be ____________…EasyNumerical value
  6. 3 Aug 2021, Shift 2 · Q23The ratio of shortest wavelength to the largest wavelength in Brackett series of atomic spectra for hydrogen atom is x:25x : 25, where the…MediumNumerical value
  7. 4 Sep 2020, Shift 1 · Q25In the line spectra of hydrogen atom, difference between the largest and the shortest wavelengths of the Lyman series is 304 Å. 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. 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.