Ionisation & Excitation Flashcards
1
Q
What is an electron volt
A
The energy needed to pass through the potential difference of a volt
2
Q
Voltage =
A
Energy / charge
3
Q
Work done =
A
Charge * potential difference
4
Q
What is ionisation
A
The amount of energy needed to remove an electron from the ground state of an atom
5
Q
What is excitation
A
The process when an electron is raised to a higher energy level but remains within the atom
6
Q
When does excitation occur
A
By collision with a free electron
By the absorption of a photon
7
Q
What is always less than the ionisation energy
A
The excitation energy
8
Q
What is de-excitation
A
- An excited, unstable atom
- The energy lost by the electron is emitted as a photon
- The electron is at a lower energy level
9
Q
Kinetic energy =
A
0.5 * mass * velocity ^2
