Pearson Edexcel International GCSE (9–1). Physics Unit: 4PH1 Paper: 2P. Graded A+

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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.*P68388A0324* Turn over 3 BLANK PAGE4 *P68388A0424* Answer ALL questions. 1 The photograph shows a security camera. The camera detects light waves and sound waves. (a) State two differences between light waves and sound waves. (2) 1 ............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... 2 ............................................................................................................................................................................................................................................................................... .................................................................................................................................................................................................................................................................................... (b) The camera detects infrared waves, which allow the camera to record videos in the dark. (i) Which of these electromagnetic waves has a longer wavelength than infrared waves? (1) A gamma rays B microwaves C ultraviolet rays D visible light waves*P68388A0524* Turn over 5 (ii) Which of these is another use for infrared waves? (1) A fluorescent lamps B heating lamps C satellite transmissions D sterilising medical equipment (iii) Which of these is a harmful effect of infrared waves? (1) A blindness B cancer C internal heating of body tissue D skin burns (c) The grid shows the oscilloscope trace for a quiet, low-pitch sound wave. The security camera has an alarm that produces a loud, high-pitch sound. On the grid, draw a trace to represent the sound wave produced by the alarm. (2) (Total for Question 1 = 7 marks)6 *P68388A0624* 2 The nuclear equation shows how a nucleus of uranium-236 may undergo nuclear fission. 236 92U → 140 54Xe + 94 38Sr + 10n (a) Determine how many neutrons are released in this fission process. (1) number of neutrons = .............................................................. (b) The table gives some of the constituents of this nuclear fission. Complete the table by putting one tick (ü) in each row to show whether th [Show More]

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