Q28.Hydrogen (1H1), Deuterium (1H2), singly ionised Helium (2He4)+ and doubly ionised lithium (3Li6)++ all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1. If the wave lengths of emitted radiation are λ1, λ2, λ3 and λ4 respectively then approximately which one of the following is correct ? (1) 4λ1 = 2λ2 = 2λ3 = λ4 (2) λ1 = 2λ2 = 2λ3 = λ4 (3) λ1 = λ2 = 4λ3 = 9λ4 (4) λ1 = 2λ2 = 3λ3 = 4λ4 JEE Main 2014 (06 Apr) JEE Main Previous Year Paper
What This Question Tests
This question tests the understanding of how the wavelength of emitted radiation in hydrogen-like atoms depends on the atomic number (Z) for a given electronic transition, including the concept of isotopes.
Concepts Tested
Formulas Used
1/λ = RZ² (1/n₁² - 1/n₂²)
📚 NCERT Sections This Tests
12.5 — A Hydrogen Atom Initially In The Ground Level Absorbs A Photon,
Physics Class 12 · Chapter 12
12.5 A hydrogen atom initially in the ground level absorbs a photon, which excites it to the n = 4 level. Determine the wavelength and frequency of photon.
12.7 — The Radius Of The Innermost Electron Orbit Of A Hydrogen Atom Is
Physics Class 12 · Chapter 12
12.7 The radius of the innermost electron orbit of a hydrogen atom is 5.3×10–11 m. What are the radii of the n = 2 and n =3 orbits?
12.6 — (A) Using The Bohr’S Model Calculate The Speed Of The Electron In A
Physics Class 12 · Chapter 12
12.6 (a) Using the Bohr’s model calculate the speed of the electron in a hydrogen atom in the n = 1, 2, and 3 levels. (b) Calculate the orbital period in each of these levels.
📋 Question Details
- Chapter
- Atoms
- Topic
- Bohr model and Rydberg formula
- Year
- 2014
- Shift
- 06 Apr
- Q Number
- Q28
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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