Mark Scheme (Results) January 2022 Pearson Edexcel International GCSE In Physics (4PH1) Paper 1P and Science (Double Award) (4SD0) Paper 1P. Graded A+

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Question number Answer Notes Marks 1 (a) B; 1 A is incorrect because the top two field lines are in the wrong direction C is incorrect because all the field lines are in the wrong direction D is ... incorrect because the second field line from the top is in the wrong direction (b) (i) B; 1 A is incorrect because there is a magnetic force on each of the magnets C is incorrect because the two nearest poles are opposite not alike D is incorrect because the forces on the magnets pass through their centres of gravity (ii) C; 1 A is incorrect because the field lines are not straight nor parallel to each other B is incorrect because the field lines are not straight nor parallel to each other D is incorrect because the field lines are not parallel to each other (c) steel / nickel / cobalt / neodymium; condone iron 1 (d) EITHER: all marks can be awarded from a diagram 3 (plotting) compass used; multiple compasses or repeated use of single compass; joining up of dots/idea of compasses forming continuous line; OR iron filings used; sprinkled / eq; ignore ‘poured’ or other heavy-handed method card tapped (to reveal pattern); Total for Question 1 = 7 marks https://britishstudentroom-b430a.web.app/Question number Answer Notes Marks 2 (a) idea of subtracting the background count rate; 1 (b) (i) time taken; allow “how long it takes” 2 reject “half the time” and either of for (radio)activity to halve; allow count rate for activity for half of the (radioactive) nuclei / atoms / isotope to decay; ignore mass, substance (ii) indication on graph of a half in count rate; e.g. line drawn across from 25 until it reaches the curve, then down to the time axis 2 2.6 (minutes); allow 2.5-2.7 (minutes) 2.3 (minutes) = 1 mark Total for Question 2 = 5 marks https://britishstudentroom-b430a.web.app/Question number Answer Notes Marks 3 (a) (i) travel at the same speed (in a vacuum) / can travel in a vacuum; allow both transverse waves, both transfer energy, both microwaves 1 (ii) wavelength; allow idea of different range / penetration ignore amplitude 1 (b) (i) speed = frequency × wavelength; allow standard symbols and rearrangements e.g. λ = v / f 1 allow c for speed ignore s for speed (ii) substitution OR rearrangement; 2 evaluation; -1 for POT error e.g. 3.0 × 10⁸ = 5.2 × 10⁹ × λ OR λ = v / f (wavelength =) 0.058 (m) allow 0.06, 0.0576…(m) [Show More]

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