Quantum

Question 1

Threshold Frequency

Answer 1

The lowest frequency of radiation that will cause electrons to be realeased from the metal due to the photoelectric effect

Question 2

Intensity

Answer 2

The amount (?) of energy per second hitting an area the metal

Question 3

Work function

Answer 3

The minimum energy required to remove an electron from the surface of the metal due to the photoelectric effect

Question 4

The photoelectric effect

Answer 4

When electrons are emitted from the surface of a metal when light of a high enough frequency is shone on it

Question 5

Photon

Answer 5

A discrete wave-packet of EM radiation

Question 6

Electron volt

Answer 6

The kinetic energy carried by an electron after it has been accelerated through a potential difference of 1 volt
1 ev = 1.6 * 10^-19 J

Question 7

Excitation (of an electron)

Answer 7

The movement of an electron to a higher energy level (relaxation is inverse)

Question 8

Ionisation Energy

Answer 8

Energy needed to remove an eletron from teh ground state atoms=

Question 9

Excited atom

Answer 9

An atom which has one or more or its electrons absorb energy and jump to a higher energy level

Question 10

Stopping potential

Answer 10

Potential difference needed to stop the fastest moving electrons with EKmax kinetic energy.
eVs = Ekmax