Physics PAPER: 2P. Pearson Edexcel International GCSE (9–1) latest 2022. 100% approved pass rate

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FORMULAE You may find the following formulae useful. energy transferred = current×voltage×time E = I×V×t frequency = 1 time period f = 1 T power = work done time taken P = Wt power = en... ergy transferred time taken P = W t orbital speed = 2 orbital radius time period π × v = 2 r π T × × (final speed)2 = (initial speed)2 + (2×acceleration×distance moved) v2 = u2 + (2×a×s) pressure×volume = constant p1×V1 = p2×V2 pressure temperature = constant p T p T 1 1 2 2 = force = change in momentum time taken F = ( ) mv mu − t change of wavelength wavelength velocity of a galaxy speed o = f light − Δ = = 0 0 0 v c λ λ λ λ λ change in thermal energy = mass×specific heat capacity×change in temperature ΔQ = m×c×ΔT Where necessary, assume the acceleration of free fall, g = 10 m/s2. This is an incomplete Hertzsprung-Russell diagram. Absolute magnitude Temperature (i) Which of these is in the shaded area of the diagram? (1) A black holes B main sequence stars C neutron stars D protostars (ii) On the diagram, draw the area to show the position of white dwarf stars. Label this area WD. (1) (iii) On the diagram, draw the area to show the position of red giant stars. Label this area RG. (1) (iv) State what is meant by the term absolute magnitude. (2) .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... http://britishstudentroom.wordpress.com/*P67161A0524* Turn over 5 (b) The Sun emits various parts of the electromagnetic spectrum. (i) Which part of the electromagnetic spectrum causes damage to human surface skin cells? (1) A microwaves B radio waves C ultraviolet D visible light (ii) Which of these increases the risk of damage to human surface skin cells? (1) A sunbathing B using protective sun cream C very cloudy weather D wearing sunglasses (Total for Question 1 = 7 marks) http://britishstudentroom.wordpress.com/6 *P67161A0624* 2 Two students investigate the speed of sound. Student A has a device that makes a loud sound. Student B has a stopwatch. A sound wave travels from student A to the wall and is reflected back to student B. 120 metres 210 metres wall A B not to scale (a) Calculate the total distance the sound wave travels from student A to the wall and back to student B. (1) distance = .............................................................. m (b) Student B hears the sound before and after the sound wave reflects from the wall. When student B hears the sound before reflection, he starts the stopwatch. When student B hears the sound after reflection, he stops the stopwatch. The students repeat this experiment five times. The table shows the students’ results. Time in s 0.50 0.62 0.52 0.58 0.55 Calculate the mean (average) time. Give your answer to 2 significant figures. [Show More]

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