A Level Edexcel Physics Paper 2 with
questions and answers 100%Correctly
verified answers latest update 2025/2026
RATED A+
Electron Gun Model Answer - CORRECT ANSWERS - Low voltage supply heats filament causes
thermionic emission/ electrons have enough energy to leave
- Electrons are repulsed from the cathode (filament) and attracted towards the anode
- This electric field causes electrons to accelerate
- There is a hole in the anode which creates a beam for electrons that pass through
- Electrons are then fired through a vacuum (to stop interfering particles) onto a fluorescent screen
Photo Electric Effect Model Answer - CORRECT ANSWERS - 1 Electron near the surface of a
metal gains 1 photon and gains enough energy to be liberated. 1-2-1 interaction
- The work function is the minimum energy needed for the electron to escape the surface
- increasing intensity will increase the number of photons
- increasing frequency will increase the energy of the photons
- These electrons released are called photoelectrons
,- This effect can be explained through E = hf
- Extra energy is then stored as the kinetic energy store in the photoelectron
- hf = Φ + EK
PhotoElectric Equation - CORRECT ANSWERS Ekmax = hf - work fucntion
Ekmax = max kinetic energy of freed electrons
hf = energy of photon
work function = the minimum energy to release an electron
Why does the photoelectric effect equation refer to kinetic energy as maximum kinetic energy? -
CORRECT ANSWERS It will not always be an equal energy transfer:
- Some energy may have been transferred to electrons below the surface
- Therefore for these electrons to liberate to the surface there will require more energy
- therefore the electrons leaves the surface will less than max
Energy Frequency equation - CORRECT ANSWERS E = hf
,E = energy
h = plank's constant
f = frequency
Work function equation - CORRECT ANSWERS Work Function = h x threshold frequency
Work Function - CORRECT ANSWERS the minimum energy needed to liberate an electron from
a metal atom
Threshold Frequency - CORRECT ANSWERS minimum light frequency necessary to liberate an
electron from a given metal
Energy is proportional to frequency
Wave Particle Duality Model Answer - CORRECT ANSWERS
Nuclear Binding Energy - CORRECT ANSWERS The energy needed to separate a nucleus into
individual protons and neutrons
E = mc^2
Binding Energy = mass difference x the speed of light^2
How to calculate nuclear binding energy from a nuclear decay equation? - CORRECT ANSWERS
Th -> Ra + a
Mass of Th nuclear-(Mass of Ra nuclear + mass of alpha particle)
, Convert u to kg
Multiply by speed of light^2 E = mc^2
Convert to Mev
How to convert u to kg - CORRECT ANSWERS kg / 1.6605x10^-27
How to convert kg to u - CORRECT ANSWERS kg / 1.6605x10^-27
What is 1 u? - CORRECT ANSWERS 1.6605x10^-27kg
Converting u to Mev - CORRECT ANSWERS u x 931.5
Converting Mev to u - CORRECT ANSWERS Mev / 931.5
Electron Volt - CORRECT ANSWERS The energy given to an electron by accelerating it through
1 volt of electric potential difference. 1.6 x 10-19 joules.
Model answer for Fission - CORRECT ANSWERS - Strong nuclear forces that hold the nucleus
together only act a small distance
- When a big nucleus absorbs a neutron it deforms the nucleus
- The electrostatic repulsion between protons becomes greater than the strong nuclear force
questions and answers 100%Correctly
verified answers latest update 2025/2026
RATED A+
Electron Gun Model Answer - CORRECT ANSWERS - Low voltage supply heats filament causes
thermionic emission/ electrons have enough energy to leave
- Electrons are repulsed from the cathode (filament) and attracted towards the anode
- This electric field causes electrons to accelerate
- There is a hole in the anode which creates a beam for electrons that pass through
- Electrons are then fired through a vacuum (to stop interfering particles) onto a fluorescent screen
Photo Electric Effect Model Answer - CORRECT ANSWERS - 1 Electron near the surface of a
metal gains 1 photon and gains enough energy to be liberated. 1-2-1 interaction
- The work function is the minimum energy needed for the electron to escape the surface
- increasing intensity will increase the number of photons
- increasing frequency will increase the energy of the photons
- These electrons released are called photoelectrons
,- This effect can be explained through E = hf
- Extra energy is then stored as the kinetic energy store in the photoelectron
- hf = Φ + EK
PhotoElectric Equation - CORRECT ANSWERS Ekmax = hf - work fucntion
Ekmax = max kinetic energy of freed electrons
hf = energy of photon
work function = the minimum energy to release an electron
Why does the photoelectric effect equation refer to kinetic energy as maximum kinetic energy? -
CORRECT ANSWERS It will not always be an equal energy transfer:
- Some energy may have been transferred to electrons below the surface
- Therefore for these electrons to liberate to the surface there will require more energy
- therefore the electrons leaves the surface will less than max
Energy Frequency equation - CORRECT ANSWERS E = hf
,E = energy
h = plank's constant
f = frequency
Work function equation - CORRECT ANSWERS Work Function = h x threshold frequency
Work Function - CORRECT ANSWERS the minimum energy needed to liberate an electron from
a metal atom
Threshold Frequency - CORRECT ANSWERS minimum light frequency necessary to liberate an
electron from a given metal
Energy is proportional to frequency
Wave Particle Duality Model Answer - CORRECT ANSWERS
Nuclear Binding Energy - CORRECT ANSWERS The energy needed to separate a nucleus into
individual protons and neutrons
E = mc^2
Binding Energy = mass difference x the speed of light^2
How to calculate nuclear binding energy from a nuclear decay equation? - CORRECT ANSWERS
Th -> Ra + a
Mass of Th nuclear-(Mass of Ra nuclear + mass of alpha particle)
, Convert u to kg
Multiply by speed of light^2 E = mc^2
Convert to Mev
How to convert u to kg - CORRECT ANSWERS kg / 1.6605x10^-27
How to convert kg to u - CORRECT ANSWERS kg / 1.6605x10^-27
What is 1 u? - CORRECT ANSWERS 1.6605x10^-27kg
Converting u to Mev - CORRECT ANSWERS u x 931.5
Converting Mev to u - CORRECT ANSWERS Mev / 931.5
Electron Volt - CORRECT ANSWERS The energy given to an electron by accelerating it through
1 volt of electric potential difference. 1.6 x 10-19 joules.
Model answer for Fission - CORRECT ANSWERS - Strong nuclear forces that hold the nucleus
together only act a small distance
- When a big nucleus absorbs a neutron it deforms the nucleus
- The electrostatic repulsion between protons becomes greater than the strong nuclear force
