AQA AS Physics Definitions Test Questions And Answers

AQA AS Physics Definitions Test Questions And Answers Specific charge - ANSWER- the charge to mass ratio or charge in coulombs divided by the mass in kilograms Isotope - ANSWER- a nucleus with the same number of protons but different number of neutrons Hadron - ANSWER- a particle that experiences the strong nuclear force. Composite particles made of either qqq (baryons) or q anti-q (baryon) Antimatter - ANSWER- Particles with the same mass but opposite charge Photoelectric effect - ANSWER- the emission of electrons from metal surfaces by light of an appropriate frequency Photon - ANSWER- a discrete packet/quantum of electromagnetic energy Work function - ANSWER- the minimum energy required for an electron to escape from the surface of the metal Threshold frequency - ANSWER- the minimum frequency of a photon required to release electrons from the surface of a metal Electron volt - ANSWER- the energy given to an electron when it passes through a potential difference of 1 V Energy Level - ANSWER- Allowed/discrete energy of an atom or electron in an atom Ionisation energy of an atom - ANSWER- the minimum energy required to remove an electron from an atom in its ground state Excitation energy - ANSWER- the energy required to move an electron from a lower energy level to a higher energy level Line spectra - ANSWER- the characteristic wavelengths of light produced by individual excited atoms Longitudinal waves - ANSWER- direction of oscillation is parallel to the direction of wave travel. Wave travels with series compressions and rarefactions. Transverse waves - ANSWER- direction of oscillation is perpendicular to the direction of wave travel with peaks and troughs.