Q28.The first three spectral lines of H-atom in the Balmer series are given λ1, λ2, λ3 considering the Bohr atomic model, the wave lengths of first and third spectral lines ( λ1λ3 ) are related by a factor of approximately x JEE Main 2021 (16 Mar Shift 1) JEE Main Previous Year Paper ×10−1 . The value of x, to the nearest integer, is ________.
What This Question Tests
This question tests the application of the Rydberg formula for the Balmer series of the hydrogen atom to calculate and compare the wavelengths of its first and third spectral lines.
Concepts Tested
Formulas Used
1/λ = R_H (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, Hydrogen spectrum (Balmer series)
- Year
- 2021
- Shift
- 16 Mar Shift 1
- Q Number
- Q28
- Type
- Numerical
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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