Pearson Edexcel International GCSE (9–1). Physics PAPER: 2P. Rated 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. http://britishstudentroom.wordpress.com/*P67161A0324* Turn over 3 BLANK PAGE http://britishstudentroom.wordpress.com/4 *P67161A0424* Answer ALL questions. 1 (a) 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 [Show More]

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