Physics > Edexcel > Pearson Edexcel International GCSE In Physics (4PH1) Paper 1PR and (Science Double Award) (4SD0) Pap (All)

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

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Question number Answer Notes Marks 1 (a) B (124); 1 A is incorrect because this is the number of protons C is incorrect because this is the number of protons and neutrons D is incorrect because t... his is twice the number of protons added to the neutrons (b) C (a high frequency electromagnetic wave); 1 A is incorrect because this is the description of alpha radiation B is incorrect because this is the description of beta radiation D is incorrect because this is the description of neutron radiation (c) all 4 rows correct = 3 marks;;; 3 2-3 rows correct = 2 marks;; any 1 row correct = 1 mark; more than one tick in a row negates the mark for that row Total for Question 1 = 5 marks https://britishstudentroom-b430a.web.app/Question number Answer Notes Marks 2 (a) D (ultraviolet); 1 A is incorrect because frequencies lower than visible light are non-ionising B is incorrect because frequencies lower than visible light are non-ionising C is incorrect because frequencies lower than visible light are non-ionising (b) one use for x-rays; 2 e.g. taking photos or detecting of (broken) bones, internal structures (of objects), allow treating cancer / sterilising medical equipment one use for gamma rays; e.g. radiotherapy, sterilising medical equipment, reference to tracing, airport scanning of luggage, irradiating food (for preservation) allow treating cancer (c) (i) speed = frequency × wavelength; allow standard symbols and rearrangements e.g. 1 λ = v / f condone s for speed (ii) substitution; 3 rearrangement; evaluation; -1 for POT error e.g. 3.0 × 108 = 2.8 ×1019 × wavelength wavelength = speed / frequency (wavelength =) 1.1 × 10-11 (m) allow 1.07… ×10-11 (m) (d) B; 1 A is incorrect because it shows an exponential relationship C is incorrect because it shows a proportional relationship D is incorrect because it shows no relationship Total for Question 2 = 8 marks https://britishstudentroom-b430a.web.app/Question number Answer Notes Marks 3 (a) idea that like poles repel; 1 (b) it is made of plastic / idea that plastic is nonmagnetic; 1 (c) correct shape e.g. lines deviating away from both magnets; reject if any field lines touch or cross except at pole 2 correct direction e.g. any arrows must face towards poles; (d) (i) reading will increase; 2 (because) magnetic field / (repulsive) force will be stronger; allow statement to the effect that magnet B will be pushed down more (by magnet A) (ii) reading will decrease; allow reading will become negative / zero ; 2 (because) magnets will now attract; allow statement to the effect that magnet B will be pulled upwards [Show More]

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