Explain

Question 1

Explain why the nuclei of some isotopes of an element are more stable than others

Question 2

Explain how observations of beta decay led to the hypothesis of the neutrino before the anti-neutrino was disovovered

Question 3

Explain why electron-lepton number and muon-lepton number are quantum numbers

Question 4

Explain what is meant by the conservation of electron-lepton number and muon-lepton number in any interaction

Question 5

Explain why the baryon number of a particle is a quantum number

Question 6

Explain what is meant by the conservation of baryon number in any interaction

Question 7

Explain how conservation laws show that strange particles are always created in pairs

Question 8

explain how the concept of exchange particles can be used to explain forces between elementary particles and their range

Question 9

Explain why particle physics relies on the collaborative efforts of large teams of scientists and engineers

Question 10

Explain how the photoelectric effect demonstrates that EM waves have a particle nature

Question 11

Explain why photoelectrons are emitted with a range of kinetic energies up to a maximum

Question 12

Explain how excitation and ionisation take place in fluorescent tubes

Question 13

Explain how line emission spectra and line absorption spectra are produced

Question 14

Explain how line emission spectra and line absorption spectra are evidence of transitions between discrete energy levels in atoms

Question 15

Explain how and why the diffraction pattern changes when the momentum of the particles which are diffracting changes