OCR Interchange October 2021 AS Level Physics/ H156/02 Depth in physics; Top score

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October 2021 AS Level Physics A H156/02 Depth in physics Time allowed: 1 hour 30 minutes INSTRUCTIONS • Use black ink. You can use an HB pencil, but onl y for graphs and diagrams. • Write your ans... wer to each question in the space provided. If you need extra space use the lined pages at the end of this booklet. The question numbers must be clearly shown. • Answer all the questions. • Where appropriate, your answer should be supported with working. Marks might be given for using a correct method, even if your answer is wrong. INFORMATION • The total mark for this paper is 70. • The marks for each question are shown in brackets [ ]. • Quality of extended response will be assessed in questions marked with an asterisk (*). • This document has 20 pages. ADVICE • Read each question carefully before you start your answer. Answer all the questions. 1 Two loudspeakers S1 and S2 are connected to a signal generator. The loudspeakers emit coherent sound waves. (a) State what is meant by the term coherent. ................................................................................................................................................... .............................................................................................................................................. [1] (b) A microphone is connected to an oscilloscope. The points O, J, K and L all lie on a straight line as shown. The microphone is moved from O to L. L K J S1 O S2 Not to scale A series of maxima and minima is observed between O and L. The microphone records a maximum at O. As it moves towards L, the first minimum is observed at J and the next maximum at K. The distance between S1 and J is 2.00 m and the distance between S2 and J is 2.08 m. The distance between S1 and K is 2.05 m and the distance between S2 and K is 2.21 m. (i) Calculate the path difference at point J between the waves from S1 and S2. path difference = m [1] (ii) State the phase difference in radian at point J between the waves from S1 and S2. phase difference = rad [1] (iii) Show that the wavelength of the sound waves is 0.16 m. [1] (c) The frequency of the sound is determined using the oscilloscope. (i) Explain how the oscilloscope is used to determine the frequency. [Show More]

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