Quantum Physics Flashcards
(7 cards)
1
Q
Definition of a Photon
A
A packet of energy
2
Q
Definition of an electron volt
A
1eV is the energy required to accelerate an electron through a potential difference of one volt
3
Q
What is an emission spectrum
A
A spectrum that shows discrete values of wavelengths by bright lines on a dark background
4
Q
Definition of excitation
A
An electron is given sufficient energy to move up to a higher energy level
5
Q
Definition of ionisation
A
When an electron is removed entirely from an ayom
6
Q
Definition of thermionic emission
A
When free electrons are released from a heated filament
7
Q
Definition of fluorescence
A
When a substance absorbs a short wavelength photon and re-emits it as a longer wavelength photon
