Physics Unit 1 AS AQA A Equations 5.0 / 5 based on 2 ratings ? PhysicsUnit 1ASAQA Created by: BryonyCreated on: 14-12-14 15:54 Specific charge (C/kg^2) charge(C)/mass (kg) 1 of 40 Energy of one photon (Joules) hf (Planck's constant = 6.63x10^-34)x(frequency of light in Hz) 2 of 40 Energy of one photon (Joules) hc/λ (Planck's constant = 6.63x10^34)x(speed of light in a vacuum = 3x10^8)/(wavelength) 3 of 40 Minimum energy needed for pair production E˅min = 2E˅0 (minimum energy needed = 2 x rest energy of particle type produced in MeV) 4 of 40 Minimum energy of a photon produced by annihilation E˅min = E˅0 (minimum energy of photon produced = rest energy of particle type annihilated in MeV) 5 of 40 Neutron decay Neutron → proton + electron + antineutrino 6 of 40 Beta plus decay Proton → neutron + positron + neutrino 7 of 40 Threshold frequency (f˅0) φ/h (work function/6.63x10^-34) 8 of 40 Photoelectric equation hf = φ + E˅k (Planck's constant x frequency = work function + maximum kinetic energy) 9 of 40 Maximum kinetic energy a photoelectron can have 1/2mv˅max^2 (1/2 mass x maximum velocity^2) 10 of 40 Convert between eV and J 1eV = 1.6x10^-19J 11 of 40 de Broglie wavelength λ = h/mv (de Broglie wavelength = Planck's constant/mass x velocity) 12 of 40 Charge ΔQ = IΔt (Charge(C) = current(A) x time) 13 of 40 Potential difference V= W/Q (p.d.(V) = work done (J)/charge (C)) 14 of 40 Convert between V and JC^-1 1V = 1JC^-1 15 of 40 Resistance R = V/I (resistance (ohms) = p.d./current) 16 of 40 Ohmic conductors I α V (Current is directly proportional to p.d.) 17 of 40 Resistivity ρ = RA/L (resistivity = (resistance x cross-sectional area)/length) 18 of 40 Power (W) P = E/t (Power = energy/time) 19 of 40 Power (W) P = VI (Power = p.d. x current) 20 of 40 Potential difference (V) V = IR (p.d. = current x resistance) 21 of 40 Power (W) P = V^2/R (power = p.d.^2 / resistance) 22 of 40 Power (W) P = I^2 x R (Power = current^2 x resistance) 23 of 40 Energy (J) E = VIt (p.d. x current x time) 24 of 40 Energy (J) E = (V^2/R)t ((p.d.^2/resistance) x time) 25 of 40 Energy (J) E = I^2Rt (current^2 x resistance x time) 26 of 40 E.M.F. ε = E/Q (electromotive force = electrical energy/charge) 27 of 40 Electromotive force ε = I(R+r) (e.m.f. = current x (load resistance + internal resistance) 28 of 40 e.m.f. ε = V+v (e.m.f = terminal p.d. + lost volts) 29 of 40 Terminal p.d. V = ε - v (terminal p.d. = e.m.f. - lost volts) 30 of 40 Terminal p.d. V = ε - Ir (terminal p.d. = e.m.f. - (current x internal resistance) 31 of 40 Kirchhoff's 2nd law ε = ΣIR 32 of 40 e.m.f. in series circuits ε = V1 + V2 + V3 33 of 40 Resistance in series circuits R˅total = R1 + R2 + R3 34 of 40 Current in parallel circuits I = I1 + I2 + I3 35 of 40 V/R˅total (V/R1) + (V/R2) + (V/R3) 36 of 40 1/R˅total (1/R1) + (1/R2) + (1/R3) 37 of 40 E.M.F. for cells in series ε˅total = ε1 + ε2 + ε3 38 of 40 Potential divider V˅out = (R2/(R1 + R2))V˅s 39 of 40 Analysing oscilloscopes f = 1/t (frequency = 1/time) 40 of 40

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