Quantum Flashcards
1
Q
Charge on an electron
A
1.6×10⁻¹⁹C
2
Q
An electron volt (eV)
A
The energy gained by 1 electron when it is accelerated through a potential difference of 1 volt.
3
Q
What is the rate of emission of photo-electrons dependant on?
A
The intensity of radiation
4
Q
Prompt emission
A
Where photo-electrons are emitted as soon as light is incident on a metal surface (even if low intensity)
5
Q
Work function
A
Minimum energy required to release electrons
6
Q
Effect on current in photoelectric cell if intensity is doubled
A
- Twice as many photons per seccond
- Twice as many electrons released per seccond
- Current doubles
7
Q
Stopping potential
A
The potential required to stop any electron from escaping from the metal surface (equal to Ekmax)
