May 2025 Edexcel: AS Level Physics 8PH0/02 Paper 2 – Core Physics II – Merged Question Paper & Mark Scheme.

May 2025 Edexcel: AS Level Physics 8PH0/02 Paper 2 – Core Physics II – Merged Question Paper & Mark Scheme. SECTION A Answer ALL questions. All multiple choice questions must be answered with a cross in the box for the correct answer from A to D. If you change your mind about an answer, put a line through the box and then mark your new answer with a cross . 1 Which of the following are S.I. units for intensity? A Jm–2 B Js –1 C Wm–2 D Ws –1 2 (Total for Question 1 = 1 mark) ■■■■ DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA         2 A diffraction grating was illuminated with light from a laser, as shown. laser diffraction grating θ D x screen A series of fringes was observed on the screen. x is the distance between the central maximum and a bright fringe. The following measurements were recorded. D = 2.00m x = 35.0cm Which of the following is the expression for the diffraction angle θ? A sin1  0.35  2.00   B sin1  2.00  0.35   C tan1  2.00  0.35   D tan1  0.35  2.00   ■■■■ (Total for Question 2 = 1 mark) 3 Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 3 When a force F is applied to a spring, the spring extends by a distance x. The spring has a spring constant k. A second identical spring is connected in parallel with the first spring. The same force F is applied to the arrangement, as shown. F What is the extension of this arrangement? A 0.25x B 0.5x C x D 2x (Total for Question 3 = 1 mark) 4 Two waves of wavelength λ are produced from two coherent sources. The waves meet at a point X and constructively interfere. Which of the following statements could describe the waves at X? A The phase difference of the waves is π. B The path difference of the waves is λ. C The frequency of the resultant wave is reduced. D The displacement of the resultant wave is 0. (Total for Question 4 = 1 mark) 4 ■■■■ DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA 5 Two points on a wave are a distance 3 λ apart. 4 Which of the following is the phase difference between the two points? π A 4 3π B 4 π C 2 3π D 2 (Total for Question 5 = 1 mark) 6 A teacher demonstrates the photoelectric effect. Monochromatic radiation is incident on the surface of a metal and photoelectrons are emitted. The intensity of the radiation is increased. Which row of the table describes what now happens to the maximum speed of the photoelectrons and the number of photoelectrons emitted per second? A B C D (Total for Question 6 = 1 mark) ■■■■ 5 Turn over DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA Maximum speed of the photoelectrons Number of photoelectrons emitted per second increases increases increases no change no change increases no change no change Questions 7 and 8 refer to the experiment described below. A falling‑ball method is used to determine the viscosity of a liquid. The liquid is in a tall container. A ball bearing is released at the top of the container and falls through the liquid. 7 Which row of the table gives two conditions for Stokes’ law to apply to the ball bearing as it falls? A B C D (Total for Question 7 = 1 mark) 8 The ball bearing has a volume V and falls through a liquid of density ρ. Which of the following is an expression for the upthrust acting on the ball bearing? A Vρg B Vg ρ C V ρg D ρg V 6 (Total for Question 8 = 1 mark) ■■■■ DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA Diameter of ball bearing relative to diameter of container Speed of ball bearing large fast large slow small fast small slow DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA BLANK PAGE 7 Turn over ■ ■ ■ ■ 9 The concentration of a sugar solution can be determined using the apparatus shown. unpolarised light eye polarising tube containing sugar solution filter A polarising filter B Unpolarised light passes through polarising filter A. The transmitted polarised light then passes through a tube containing the sugar solution. This changes the plane of polarisation of the light. Polarising filter B is rotated and the change in the angle of the plane of polarisation of the light is measured. (a) Explain what is meant by the plane of polarisation of light. 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(b) (i) Initially the tube is empty. No light is observed. Explain how A and B are aligned when no light is observed