Aqa A Level Physics Paper 1 Study Guide Questions And Correct Answers

What is the purpose of coating in a fluorescent tube? {Ans: 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)}define density of a material {Ans: mass per unit volume}explain what is meant by spring constant (k) {Ans: force divided by extention}Explain the difference between excitation and ionisation (2) {Ans: 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}conditions for equilibrium {Ans: resultant force is 0 (1) resultant torque is 0 (1)}What is meant by the ground state? {Ans: The lowest energy state of an atom}