# Final. Mark Scheme. Physics A PHYA1. (Specification 2450) Unit 1: Particles, quantum phenomena and electricity

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1 Version.0 General Certificate of Education (A-level) June 0 Physics A PHYA (Specification 450) Unit : Particles, quantum phenomena and electricity Final Mark Scheme

3 Mark Scheme General Certificate of Education (A-level) Physics A PHYA June 0 Question Part Sub Part Marking Guidance Mark Comments (a) (i) protons = 0 neutrons = 8 electrons = 8 (a) (ii) =. 0-9 (C) -ve sign loses mark (a) (iii) specific charge =. 0-9 /( ) specific charge = C kg - Allow.66 Allow CE from (ii) First mark is for mass if miss out electron mass and do not justify lose first mark (a) A = down B = W + C = positron and D= (electron) neutrino symbols OK NOT neutron C and D either way round (b) (i) weak (b) (ii) B/W (+) (b) (iii) W + /B/exchange particle is charged/γ no charge W + /B/exchange particle has (rest) mass/γ has zero (rest) mass photon has infinite range exchange particle must be clearly identified don t accept W + more mass or shorter range (c) Any two pairs Quantity: lepton number e + (-) +ν (e) () = 0 after same as before Quantity: charge u( +/) before -d(/) = +/ after decay Quantity: baryon number proton and neutron (can be shown through quarks) 4 can use p(+) and e + (+)to show charge conserved Each number must be correctly linked to a particle at least once for second mark Strangeness not allowed

5 Mark Scheme General Certificate of Education (A-level) Physics A PHYA June 0 The explanation expected in a competent answer should include a coherent selection of the following points concerning the physical principles involved and their consequences in this case. example of hadron and lepton mention of strong interaction mention of quark structure hadrons leptons are fundamental identify baryons and mesons gives quark structure of baryons and mesons similarities e.g. all have rest mass all affected by weak interaction if charged both experience electromagnetic interaction (b) (i) a correct example of particle e.g. electron and correct example of antiparticle e.g. positron Allow correct symbols Allow antielectron for positron Also allow pi zero and gamma (b) (ii) correct difference e.g. opposite charge/other named quantum number must be consistent with (i) 4 (a) energy of photon is constant/fixed energy given to electron is fixed energy required for electron to leave/escape/emit from the surface/metal electron has to overcome work function maximum kinetic energy is the energy of photon minus the work function deeper electrons require energy to get to the surface have less E k than surface electrons max mention of energy levels means can only score first mark photoelectric equation alternative for third mark if φ and hf defined 4 (b) (i) (use of E = hf) energy of photon = = (J) work function = hf E k = = work function = / = (.8 ev) hf gets first mark even if in wrong equation 4 b (ii) work function = hf 0 f 0 = / = (Hz) ( sig figs) sig. fig stand alone mark Accept

6 Mark Scheme General Certificate of Education (A-level) Physics A PHYA June 0 4 (c) (i) decrease the energy of( incident) photons decrease the maximum kinetic energy of electrons decrease the energy of( incident) photons hence fewer deeper electrons escape below threshold frequency no electrons emitted as energy of each photon decreases but intensity is constant ( there are more photons/sec) number of emitted electrons(/sec) must increase for last two alternatives must get first mark before can qualify for second mark 4 (c) (ii) increase in photons cause increase in (emitted) electrons double number of electrons/photons reference to rate/per second if refer to energy levels/atoms can only award first mark 5 (a) (i) 8 V 5 (a) (ii) 64 V CE from (i) 5 (a) (iii) V rms = 64/ =45. V CE from (ii) 5 (a) (iv) frequency = /0.0 = 00 Hz do not accept khz for unit mark unless correct for candidate value if use 0 s instead of 0 ms then can score second two marks 5 (b) horizontal line through y = 45 (44 48) x =0 CE from (a)(iii)+/- half square straight line must extend to at least to 6.0 ms 6

7 Mark Scheme General Certificate of Education (A-level) Physics A PHYA June 0 5 (c) connect to y-input adjust/change time base so that each division is.0 ms 0 ms across screen reference to y-gain/sensitivity max if inappropriate numbers quoted for y gain then lose last mark 6 (a) (i) (use of V=Ir) V= 4..5 = 6. (V) 6 (a) (ii) pd = 6. = 5.7 V NO CE from (i) 6 (a) (iii) (use of I = V/R) I = 5.7/.0 =.8(5) A CE from (ii) (a(ii)/.0) accept.8 or.9 6 (a) (iv) I = =.(5) A 6 (a) (v) R= 5.7/.5 =4. Ω CE from (iii) (4. (a)(iii)) accept. or.4 CE from (iv) (a(ii)/(a)(iv)) Accept range 4.4 to 4. 6 (a) (vi) parallel = 4. + =.5 Ω.0 = 0.77 R parallel R R total = =.85 Ω R = /4. R=.85 Ω CE from (a)(v) second mark for adding internal resistance 7

8 Mark Scheme General Certificate of Education (A-level) Physics A PHYA June 0 6 (b) (i) resistor Rate of energy dissipation (W).5 Ω internal resistance 4..5 = Ω.85.0 = 6. ( ) R.5 4. = 7.7 (7. 8.) CE from answers in (a) but not for first value.0: a(iii) R: a(iv) a(v) 6 (b) (ii) energy provided by cell per second = 4. = 50.4 (W) energy dissipated in resistors per second = = 50.4 (hence energy input per second equals energy output) if not equal can score second mark if an appropriate comment 7 (a) (i) (use of I = V/R) I = 6.0/( ) = A first mark for adding resistance values 90 k Ω accept or dotted but not and not (a) (ii) V= = 0. (0. 0.5) V V=5/90 6 = 0.( V) CE from (i) BALD answer full credit 0. OK and dotted 0. 7 (b) resistance of LDR decreases reading increase because greater proportion/share of the voltage across R higher current need first mark before can qualify for second 7 (c) I= 0.75/5000 = (A) (pd across LDR = 0.75 (V)) pd across variable resistor = = 4.5 (V) R=4.5/ = Ω I= 0.75/5000 = (A) R tota l = 6.0/ = Ω R = = Ω 8

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