BRAINCAKEExcitation Using Photons
When an electron absorbs a photon it gains enough energy to move into an outer shell where a vacancy exists if the energy of the photon is equal to the difference between the initial and final energy levels of the electron.
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Key terms in this lesson
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
More in The Photoelectric Effect
- Ionisation
- Measuring Ionisation Energy
- Energy of Electrons
- Electron Excitation by Collisions
- De-excitation
- Fluorescence
- Fluorescent Tube
- Line Spectra
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics