Mark Scheme (Results) January 2021 Pearson Edexcel International GCSE In Physics (4PH1) Paper 1PR and Science (Double Award) (4SD0) Paper 1PR

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Question number Answer Notes Marks 1 (a) -1 for each additional line 4 (b) (i) A - electrical; 1 (ii) B - light radiation; 1 (Total for Question 1 = 6 marks)Question number Answer Notes Marks 2... (a) thermometer part of spectrum P infrared; Q red R green / yellow; S violet T ultraviolet; allow all valid colours/ visible 3 (b) any reference to absorption; allow reference to reflection 2 black is the better/best/good absorber; allow reference to ‘poor reflector’ (c) infrared/IR; 1 (Total for Question 2 = 6 marks)Question number Answer Notes Marks 3 (a) planet; 1 (b) comet; accept planet 1 (c) substitution into given formula; 3 conversion of 35 days into seconds; evaluation; allow full credit for 2.6927937 × 1010 if unit changed to m/day. e.g. v = 2 × π × 1.5 × 1011/(35 × 24 × 60 × 60) v = 310 000 m/s 311665.93(7)8 Answer for incorrect/no conversion of days→ seconds 2.69etc x 1010 scores 2 -1 for POT error (Total for Question 3 = 5 marks) [Show More]

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