AQA A LEVEL PHYSICS (PAPER 1)EXAM
LATEST UPDATE 2024 ACTUAL QUESTIONS
AND CORRECT ANSWERS|GRADED A+
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)
Bright fringes (maxima) are wider
How do diffraction patterns (fringes on the screen) form? - ANSWER-
Interference (1)
from light from two slits overlapping (superposition) (1)
maxima where crests meet (constructive interference) (1)
dark fringes/minima form where crest and trough meet (destructive
interference) (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 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)
, 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)
Formation of a stationary wave - ANSWER-Two waves superpose (1)
same wavelength and/or frequency (1)
Travelling with equal and opposite velocity (direction of movement)
(1)
stationary vs progressive waves (3 for each) - ANSWER-stationary:
have nodes/antinodes (1) points between nodes all in phase (1)
cannot transfer energy
progressive: no nodes/antinodes (1) within one wavelength all points
are out of phase (1) can transfer energy
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