GCE. Physics B (Advancing Physics) Mark Scheme for June Advanced GCE G494. Rise and Fall of the Clockwork Universe

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1 GCE Physics B (Advancing Physics) Advanced GCE G494 Rise and Fall of the Clockwork Universe Mark Scheme for June 200 Oxford Cambridge and RSA Examinations

2 OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of qualifications to meet the needs of pupils of all ages and abilities. OCR qualifications include AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry Level qualifications, NVQs and vocational qualifications in areas such as IT, business, languages, teaching/training, administration and secretarial skills. It is also responsible for developing new specifications to meet national requirements and the needs of students and teachers. OCR is a not-for-profit organisation; any surplus made is invested back into the establishment to help towards the development of qualifications and support which keep pace with the changing needs of today s society. This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which marks were awarded by Examiners. It does not indicate the details of the discussions which took place at an Examiners meeting before marking commenced. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes should be read in conjunction with the published question papers and the Report on the Examination. OCR will not enter into any discussion or correspondence in connection with this mark scheme. OCR 200 Any enquiries about publications should be addressed to: OCR Publications PO Box 5050 Annesley NOTTINGHAM NG5 0DL Telephone: Facsimile: publications@ocr.org.uk

3 G494 Mark Scheme June 200 Question expected answer mark Additional guidance a N kg - b J kg - K - 2a E = 0.5CV 2 =.2(5) 0-3 J ignore anything more than two sig. figs e.g for [] 2b 3a 3b 3c (current is) flow of charge (off capacitor, through circuit); EITHER p.d. across capacitor/resistor decreases (as capacitor loses charge) rate of charge release proportional to charge (on capacitor) Nm 3p D = = ( ) V 2 c 2 3p c = = 500 m s - D gas particles change direction; because they collide (with other particles); ignore references to discharging not just charge on capacitor decreases accept electrons as charge accept I = Q/t or wtte for [] look for D = Nm/V N = earns [0] ignore references to random ignore description of random walk 4a 4b A.6 0 N = = = λ A = A 0 e -λt = Bq 5 4 N = gives Bq for [] ignore sign of answer

4 G494 Mark Scheme June EITHER C and D D and C 2 each correct response for [] remember Don't Care 6a 6b N pv = kt = 3. 0 NkT = J 24 7 correct pattern for [] look for at least two sig. figs in their answer, rounding to accept correct reverse calculation 3NkT/2 gives J for [] 5NkT/2 gives J or J for [] 8 correct pattern for [2] one mistake for [] a mistake is an extra tick, a missing tick or a tick in the wrong place 9 A C D 2 only one mistake for [] remember All Can Do 2

5 G494 Mark Scheme June 200 0a particles bounce off ground; momentum of particles/ground changes; EITHER force on ground is its rate of change of momentum momentum change of particle requires a force, so equal and opposite force on the ground accept collide/hit QWC mark - must use correct terms for third marking point 0bi p = (N/V)C where C = kt = constant 0bii probability of a particle at h is e ε kt where ε = mgh is gravitational/potential energy of particle; ; accept fraction/proportion for probablility accept GPE 0biii Pa accept more than 2 sig. fig. 3

6 G494 Mark Scheme June 200 0c EITHER more energy in system so more particles get lucky and able to reach that height T = some value above 290 K (b)(iii) correctly recalculated increased KE/speed/velocity of particles increased collision rate increased momentum of particles increased momentum change per collision kt increases accept pv = nkt so p increases with increasing T for [] 2 accept increase of c so p = ρc / 3 increases for [] accept (-)E/kT or (-)mgh/kt decreases (as T increases) 2 so E kt mgh e e / BF / kt increases 4

7 G494 Mark Scheme June 200 ai all lines at 45 from (0,0) changes direction at (?,4) and ends at (0,8) accept lines drawn freehand aii time out = time back because speed of light is constant accept one-way time is half total time ignore references to distance accept pulse travels at speed of light aiii s = = m accept m bi bii c pulse-echo time is now 7.34 s less than before, (so reduced distance) s at 950 s is m (.20-.0) 0 9 /946 =. 0 5 m s - (measure) change of wavelength Δλ apply z = Δλ/λ = v/c accept pulse-echo time is reduced by 0.66 s for [2] accept calculation of new distance of. 0 9 m for [2] allow ecf from incorrect bi and aiii accept.(0) 0 5 m s - allow ecf incorrect new distance to asteroid for [] accept increase or decrease of wavelength accept measure the red/blue shift for [] 5

8 G494 Mark Scheme June 200 2ai Sound energy produced (at expense of kinetic energy). 2aii Δp = 2.0 ( ) = 6.6 Ns for hammer p = 6.6 Ns for mass v = 6.6 / 0 =.7 m s - look for attempt at momentum conservation [] correct substitution for [] evaluation for [] so 0.34 m s - for [2] 2b correct shape and period correct phase over the whole time span, any constant amplitude 2ci a = = m s -2 v = = m s - average speed = m s - x = = cii (do two or more successive calculations) for shorter time intervals allow ecf from one step to the next accept correct use of s = ut + at 2 /2 for full marks ignore use of x = Acos(2πft) 6

9 G494 Mark Scheme June 200 3a [] for each correct arrow 2 mark the direction of the arrow if it doesn't pass through the comet 3bi E k = /2mv 2 so E k /m = v 2 /2 E k /m = ( ) 2 /2 = J kg - 3bii GMm E g GM E g = so = ( =V g ) r m r = / = -.5() 0 9 J kg - E t = E g + E k = ( J kg - ) ignore calculation of total energy, but accept J kg - 3biii E g = J kg - E k = ( ) = J kg - 6 so v = = m s - calculate new value for E g using -GM/r for [] ecf: calculate new E k by E t - E g for [] ecf: calculate v from E k for [] accept m s - for [3] 7

10 OCR (Oxford Cambridge and RSA Examinations) Hills Road Cambridge CB 2EU OCR Customer Contact Centre 4 9 Qualifications (General) Telephone: Facsimile: general.qualifications@ocr.org.uk For staff training purposes and as part of our quality assurance programme your call may be recorded or monitored Oxford Cambridge and RSA Examinations is a Company Limited by Guarantee Registered in England Registered Office; Hills Road, Cambridge, CB 2EU Registered Company Number: OCR is an exempt Charity OCR (Oxford Cambridge and RSA Examinations) Head office Telephone: Facsimile: OCR 200

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