BRAINCAKEMeasuring Ionisation Energy
Electrons are emitted from a heated filament in a sealed tube and are attracted to a positive anode. Gas atoms in the sealed tube collide with electrons of increasing speed.
The potential difference is increased to increase the speed of the electrons.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
Key terms in this lesson
- Electron volt
- The energy transferred when an electron moves through a potential difference of one volt, equal to 1.6 times ten to the minus 19 joules.
- Ionisation
- The removal of one or more electrons from a neutral atom, or the addition of electrons, to form an ion.
- Potential difference
- The energy transferred per unit charge as charge moves between two points in a circuit.
More in The Photoelectric Effect
- The Stopping Potential
- Planck's Quantum Theory
- The Vacuum Photocell
- Ionisation
- Energy of Electrons
- Electron Excitation by Collisions
- Excitation Using Photons
- De-excitation
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics