Pearson Edexcel International GCSE In Physics (4PH1) Paper 2P.. Mark Scheme (Provisional) Summer 2021

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Question number Answer Notes Marks 1 (a) (i) B – main sequence stars; 1 A is not correct as black holes do not appear on the HR diagram C is not correct as neutron stars are not part of the ma... in sequence. D is not correct as protostars are not part of the main sequence (ii) bottom left area of the HR diagram; unlabelled scores 0 1 (iii) top right hand area of HR diagram; unlabelled scores 0 1 (iv) a measure of brightness/luminosity; accept power 2 idea that a star would be at a standard distance (10 parsecs/32(.6) light years); ignore lack of or incorrect value for distance (b) (i) C – ultraviolet; 1 A is not correct as microwaves cause internal heating B is not correct as radio waves do not give skin burns D is not correct as visible light cannot harm skin cells. (ii) A – sunbathing; 1 B, C and D are not correct as all reduce the absorption of UV by skin. Total for Question 1: 7 marks http://britishstudentroom.wordpress.com/Question number Answer Notes Marks 2 (a) 300 (metres); 1 (b) 0.554; 2 any answer given to 2 sf; mark independently correct answer = 0.55 (s) e.g. (0.50+0.62+0.52+0.58+0.55)/5 = 0.554 (s) = 0.55 (s) to 2 s.f. (c) difference in distance is 180 m; 4 recall of equation: speed = distance / time taken; allow use of standard symbols e.g. v = d/t condone s for v, s for d substitution; ECF incorrect distance and ECF incorrect time from (b) correct evaluation; correct answer = 330 (m/s) answer is 327.2727… (m/s) e.g. speed = (300 – 120)/0.55 speed = 180/0.55 speed = 327.2727... (m/s) answer is 324.90... (m/s) if 0.554(s) is used (d) human reaction time; 1 accept alternative valid variables e.g. wind speed, temperature, humidity, air pressure Total for Question 2: 8 mark [Show More]

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