AQA AS PHYSICS 7407/1 2026 ACTUAL TEST
PAPER QUESTIONS SOLUTIONS VERIFIED
COMPLETE STUDY PACKAGE
◉ 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)
◉ 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)
PAPER QUESTIONS SOLUTIONS VERIFIED
COMPLETE STUDY PACKAGE
◉ 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)
◉ 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)
