Q17.The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is: (1) 121. 8 nm (2) 194. 8 nm (3) 490. 7 nm (4) 913. 3 nm JEE Main 2021 (25 Feb Shift 2) JEE Main Previous Year Paper
What This Question Tests
This question is a direct application of the formula for wavelength of a photon emitted during an electron transition in a hydrogen atom between specified energy levels.
Concepts Tested
Formulas Used
1/λ = RZ² (1/n₁² - 1/n₂²)
hc/λ = E₂ - E₁
E_n = -13.6/n² eV
📚 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.
12.3 — A Difference Of 2.3 Ev Separates Two Energy Levels In An Atom. What
Physics Class 12 · Chapter 12
12.3 A difference of 2.3 eV separates two energy levels in an atom. What is the frequency of radiation emitted when the atom make a transition from the upper level to the lower level?
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
- Bohr's model of hydrogen atom
- Year
- 2021
- Shift
- 25 Feb Shift 2
- Q Number
- Q17
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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