BRAINCAKEExam Question 5
Question
Some of the energy levels of a hydrogen atom are: n = 1: −13.6 eV, n = 2: −3.40 eV, n = 3: −1.51 eV.
(a) Explain why the energy levels have negative values. (1)
(b) An electron falls from n = 2 to n = 1. Calculate the wavelength of the photon emitted and state the region of the electromagnetic spectrum it is in. (4)
(c) State how many different photon energies can be emitted by electrons de-exciting from n = 3 to the ground state. (1)
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Key terms in this lesson
- energy level
- One of the discrete, fixed values of energy that an electron in an atom can have.
- ground state
- The lowest, most stable energy level of an electron in an atom.
More in Quantum Physics
- Excitation and De-excitation
- Line Spectra
- Exam Question 1
- Exam Question 2
- Exam Question 3
- Exam Question 4
- Exam Question 6
- Exam Question 7
All 21 lessons in Quantum Physics · All Edexcel AS-level Physics topics