A Level Edexcel Physics Paper 2 Exam With 100% Correct Answers 2024

Electron Gun Model Answer - correct answer-- 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 answer-- 1 Electron near the surface of a metal gains 1 photon and gains enough energy to be liberated - The work function is the 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 PhotoElectric Equation - correct answer-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 answer-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 be heat transfer through collision - therefore the electrons leaves the surface will less than max Energy Frequency equation - correct answer-E = hf E = energy h = plank's constant f = frequency Work function equation - correct answer-Work Function = h x threshold frequency Work Function - correct answer-the minimum energy needed to liberate an electron from a metal atom Threshold Frequency - correct answer-minimum light frequency necessary to liberate an electron from a given metal Energy is proportional to frequency Wave Particle Duality Model Answer - correct answer- Nuclear Binding Energy - correct answer-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 answer-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 answer-kg / 1.6605x10^-27 How to convert kg to u - correct answer-kg / 1.6605x10^-27 What is 1 u? - correct answer-1.6605x10^-27kg Converting u to Mev - correct answer-u x 931.5