2- definitions

Question 1

Beta-minus decay

Answer 1

The process of a neutron inside a nucleus turning into a proton, and emitting a beta-minus particle (an electron) and a antineutrino

Question 2

Beta-plus decay

Answer 2

The process of a proton inside a nucleus turning into a neutron emitting a beta-plus particle(a positron) and a neutrino

Question 3

Electron Diffraction

Answer 3

The spreading of electrons as they pass through a gap of size similar to their de Broglie wavelength . It is evidence of the wave-like properties of particles

Question 4

Ionisation

Answer 4

The process of an atom losing an orbital electron and becoming charged

Question 5

Stopping potential

Answer 5

The minimum potential difference required to stop the highest kinetic energy electrons from leaving the metal during the photoelectric effect

Question 6

Threshold frequency

Answer 6

The minimum frequency of photons for photoelectrons to be emitted from the metal plate during the photoelectric effect. It is equal to the metals work function / planck’s constant

Question 7

Work function

Answer 7

The minimum energy required to remove an electron from a metal’s surface