Q26.A hypothetical atom has only three energy levels. The ground level has energy, E1 = −8eV. The two excited states have energies, E2 = −6eV and E3 = −2eV. Then which of the following wavelengths will not be present in the emission spectrum of this atom? (1) 207 nm (2) 465 nm (3) 310 nm (4) 620 nm
What This Question Tests
This question tests the ability to calculate all possible photon energies (and thus wavelengths) corresponding to transitions between given energy levels in a hypothetical atom and identify which wavelength among the options is not possible.
Concepts Tested
Formulas Used
E = hc/λ
hc = 1240 eV-nm
📚 NCERT Sections This Tests
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?
12.5 — 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?
📋 Question Details
- Chapter
- Atoms
- Topic
- Atomic energy levels, Emission spectrum
- Year
- 2012
- Shift
- 12 May Online
- Q Number
- Q26
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 12: Atoms
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