Unit 2 - Spectra Flashcards
1
Q
What is the threshold frequency?
A
The minimum frequency of a photon which will eject an electron from a material
2
Q
What is the work function?
A
The minimum energy required to eject an electron from a material
3
Q
What is irradiance?
A
The power per unit area
4
Q
What is the unit used for irradiance?
A
Watts per square metre ( Wm^-2)
5
Q
What happens when you double the distance when measuring irradiance?
A
The irradiance is quartered
6
Q
What is the photoelectric effect?
A
When electrons are emitted from materials as they absorb energy from light
