AQA AS PHYSICS 7407/1 2026 FINAL REVIEW
QUESTIONS ANSWERS BUNDLED PRACTICE
COLLECTION
◉ 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)
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
QUESTIONS ANSWERS BUNDLED PRACTICE
COLLECTION
◉ 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)
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
