Q19.Hydrogen atom from excited state comes to the ground by emitting a photon of wavelength λ. The value of principal quantum number n of the excited state will be : ( R : Rydberg constant) (1) √λRλ−1 (2) √ λR−1λR (3) √ λR−1λ (4) √λR2λR−1
What This Question Tests
This question applies the Rydberg formula for the hydrogen spectrum to find the initial principal quantum number of an excited state when a photon of a specific wavelength is emitted to the ground state.
Concepts Tested
Formulas Used
1/λ = R(1/n_f^2 - 1/n_i^2)
📚 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.
12.4 — The Ground State Energy Of Hydrogen Atom Is –13.6 Ev. What Are The
Physics Class 12 · Chapter 12
12.4 The ground state energy of hydrogen atom is –13.6 eV. What are the kinetic and potential energies of the electron in this state?
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?
📋 Question Details
- Chapter
- Atoms
- Topic
- Bohr Model and Hydrogen Spectrum
- Year
- 2022
- Shift
- 25 Jul Shift 2
- Q Number
- Q19
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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