AQA A LEVEL PHYSICS PAPER 1 EXAM UPDATED EXAM WITH VERIFIED SOLUTIONS.
What is meant by work function (2) - (answer)Minimum energy required by an electron to escape from
(1) a metal surface (1)
What is meant by ionisation energy? (2) - (answer)Minimum energy required to remove an electron
from an atom (1) from the ground state (1)
Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) -
(answer)Energy of a photon is fixed/constant (1)
Energy is required for electrons to overcome work function ø (1)
Electrons deeper into/below the surface of the metal require more energy to overcome work function
and therefore have less KE(1)
Maximum KE = Energy of photon - work function ø (1)
Explain how (bright ring) diagram is evidence of the wave-particle duality of electrons? -
(answer)Diffraction pattern maxima/minima (bright and dark areas) (1)
Diffraction is a property of waves- proves wave-behaviour of electrons (1)
What is meant by the ground state? - (answer)The lowest energy state of an atom
Explain the difference between excitation and ionisation (2) - (answer)An electron receives a discrete
amount of energy for BOTH (1)
Excitation promotes an electron to a higher energy level
Ionisation is when an electron receives enough energy to leave the atom
Explain why only photons of certain frequencies cause excitation (4) - (answer)discrete energy levels (1)
Electrons need to absorb a DISCRETE amount of energy to move to a higher energy level (1)
Photons need to have a certain frequency to provide this energy, because E=hf (1)
interaction is a 1:1 reaction all of the photon's energy is absorbed (1)
, AQA A LEVEL PHYSICS PAPER 1 EXAM UPDATED EXAM WITH VERIFIED SOLUTIONS.
Explain how excitation takes place in a fluorescent tube - (answer)Electrons flow through the tube to the
applied PD causing a current to flow (1)
Electrons collide with mercury atoms in the tube (1)
This raises electrons in the mercury atom to a higher energy level (1)
What is the purpose of coating in a fluorescent tube? - (answer)UV/ High energy photons emitted from
mercury atoms when the electrons in the atom de-excite (1)
High energy photons absorbed by the coating (1)
Coating emits photons in the visible spectrum (1)
What happens when annihilation occurs? (2) - (answer)particle and an anti-particle collide and cease to
exist (1)
Their mass is released as energy in the form of a pair of gamma photons (1)
How does the strong nuclear force between two nucleons vary with the separation of the nucleons? (3) -
(answer)repulsive at < 0.5 fm (1)
attractive from 0.5 to 3 fm (1)
above 3 fm, force 0 (1)
What is meant by monochromatic light - (answer)light of a single frequency
What is meant by coherent - (answer)constant phase difference
Effect on diffraction pattern when wavelength decreases (3) - (answer)Maxima closer together (1) angle
decreases (1) smaller path difference (1)
What happens when white light is used in slits instead of monochromatic light? (4) - (answer)Central
bright fringe (maximum) is white (1)
Fringes on either side are continuous spectra (1)
Dark fringes would be closer together due to λred being larger than the average λwhite (1)
What is meant by work function (2) - (answer)Minimum energy required by an electron to escape from
(1) a metal surface (1)
What is meant by ionisation energy? (2) - (answer)Minimum energy required to remove an electron
from an atom (1) from the ground state (1)
Why do emitted electrons have a kinetic energy that varies up to a maximum value? (4) -
(answer)Energy of a photon is fixed/constant (1)
Energy is required for electrons to overcome work function ø (1)
Electrons deeper into/below the surface of the metal require more energy to overcome work function
and therefore have less KE(1)
Maximum KE = Energy of photon - work function ø (1)
Explain how (bright ring) diagram is evidence of the wave-particle duality of electrons? -
(answer)Diffraction pattern maxima/minima (bright and dark areas) (1)
Diffraction is a property of waves- proves wave-behaviour of electrons (1)
What is meant by the ground state? - (answer)The lowest energy state of an atom
Explain the difference between excitation and ionisation (2) - (answer)An electron receives a discrete
amount of energy for BOTH (1)
Excitation promotes an electron to a higher energy level
Ionisation is when an electron receives enough energy to leave the atom
Explain why only photons of certain frequencies cause excitation (4) - (answer)discrete energy levels (1)
Electrons need to absorb a DISCRETE amount of energy to move to a higher energy level (1)
Photons need to have a certain frequency to provide this energy, because E=hf (1)
interaction is a 1:1 reaction all of the photon's energy is absorbed (1)
, AQA A LEVEL PHYSICS PAPER 1 EXAM UPDATED EXAM WITH VERIFIED SOLUTIONS.
Explain how excitation takes place in a fluorescent tube - (answer)Electrons flow through the tube to the
applied PD causing a current to flow (1)
Electrons collide with mercury atoms in the tube (1)
This raises electrons in the mercury atom to a higher energy level (1)
What is the purpose of coating in a fluorescent tube? - (answer)UV/ High energy photons emitted from
mercury atoms when the electrons in the atom de-excite (1)
High energy photons absorbed by the coating (1)
Coating emits photons in the visible spectrum (1)
What happens when annihilation occurs? (2) - (answer)particle and an anti-particle collide and cease to
exist (1)
Their mass is released as energy in the form of a pair of gamma photons (1)
How does the strong nuclear force between two nucleons vary with the separation of the nucleons? (3) -
(answer)repulsive at < 0.5 fm (1)
attractive from 0.5 to 3 fm (1)
above 3 fm, force 0 (1)
What is meant by monochromatic light - (answer)light of a single frequency
What is meant by coherent - (answer)constant phase difference
Effect on diffraction pattern when wavelength decreases (3) - (answer)Maxima closer together (1) angle
decreases (1) smaller path difference (1)
What happens when white light is used in slits instead of monochromatic light? (4) - (answer)Central
bright fringe (maximum) is white (1)
Fringes on either side are continuous spectra (1)
Dark fringes would be closer together due to λred being larger than the average λwhite (1)
