Particles and Radiation

Question 1

Isotopes

Answer 1

Atoms with the same number of protons but different number of neutrons

Question 2

Isotopic data

Answer 2

relative amount of different isotopes of an element present within a substance

Question 3

Photoelectric Effect

Answer 3

The emission of electrons from the surface of a metal due to electromagnetic radiation

Question 4

Threshold frequency

Answer 4

The minimum frequency of incident electromagnetic radiation required to remove a photoelectron from the surface of a metal due

Question 5

Threshold Wavelength

Answer 5

The longest wavelength required from incident electromagnetic radiation to remove a photoelectron from the surface of a metal

Question 6

Work Funtion

Answer 6

The minimum energy required to remove a photoelectron from the surface of the metal. (an electron can only escape from the surface of the metal if it absorbs a photon which has an energy equal to Φ or higher)

Question 7

Stopping Potential

Answer 7

The potential difference required to stop photoelectron emission from occurring

Question 8

Photoelectric current

Answer 8

A measure of the number of electrons emitted per second

Question 9

Excitation

Answer 9

When an electron absorbs enough energy to move to a higher energy level

Question 10

Ionisation

Answer 10

It is when an atom absorbs or emits an electron therefore it becomes charged.