In a hydrogen atom, an electron falls from the -1.51 eV level to the -3.40 eV level. What is the energy of the emitted photon?
Answer and explanation
Correct answer: D. 1.89 eV
- Step 1: Photon energy difference in levels eV. Answer: 1.89 eV. Why not the others: 4.91 eV adds the magnitudes; 1.51 eV and 3.40 eV are each single level energies.
Practise more Quantum and atomic physics.
Free questions with an explanation for every one, and full timed A-Level UK (AQA, Edexcel, OCR) mock tests.
More Quantum and atomic physics questions
- What is the energy of a photon of wavelength 500 nm? (h = 6.63 x 10^-34 J s, c = 3.00 x 10^8 m/s)
- A metal has a work function of 2.3 eV. Light of photon energy 3.1 eV falls on it. What is the maximum kinetic energy of the emitted electron…
- An electron moves at 1.0 x 10^6 m/s. What is its de Broglie wavelength? (m = 9.11 x 10^-31 kg, h = 6.63 x 10^-34 J s)
- What do electron diffraction patterns provide evidence for?
- A metal has a work function of 2.3 eV. What is its threshold frequency? (h = 6.63 x 10^-34 J s, 1 eV = 1.60 x 10^-19 J)