BRAINCAKEFluorescent Tube
A fluorescent Tube is a glass tube with a fluorescent coating on its inner surface containing mercury vapour at low pressure.
The free electrons are accelerated when a p.d. is applied to the tube.
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Key terms in this lesson
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
- Ionisation
- The removal of one or more electrons from a neutral atom, or the addition of electrons, to form an ion.
- Excitation
- The process by which an electron in an atom gains energy and moves to a higher, unoccupied energy level.
- De-excitation
- The process by which an electron in an excited atom falls to a lower energy level, emitting a photon whose energy equals the difference between the two levels.
- Potential difference
- The energy transferred per unit charge as charge moves between two points in a circuit.
More in The Photoelectric Effect
- Electron Excitation by Collisions
- Excitation Using Photons
- De-excitation
- Fluorescence
- Line Spectra
- Excitation of Hydrogen Atoms
- The Discovery of Helium
- The Dual Nature of Light
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics