Q19.If λ1 and λ2 are the wavelengths of the third member of Lyman and first member of the Paschen series respectively, then the value of λ1 : λ2 is : (1) 7 : 135 (2) 1 : 9 (3) 1 : 3 (4) 7 : 108
What This Question Tests
This question tests the ability to apply the Rydberg formula for different spectral series (Lyman and Paschen) in the hydrogen atom to find the ratio of specific wavelengths.
Concepts Tested
Formulas Used
1/λ = R (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?
12.8 — A 12.5 Ev Electron Beam Is Used To Bombard Gaseous Hydrogen At
Physics Class 12 · Chapter 12
12.8 A 12.5 eV electron beam is used to bombard gaseous hydrogen at room temperature. What series of wavelengths will be emitted?
📋 Question Details
- Chapter
- Atoms
- Topic
- Hydrogen Spectrum
- Year
- 2021
- Shift
- 26 Feb Shift 1
- Q Number
- Q19
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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