A-level PHYSICS Paper 3

A-level PHYSICS Paper 3 Section A Materials For this paper you must have: • a pencil and a ruler • a scientific calculator • a Data and Formulae Booklet • a protractor. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. Time allowed: The total time for both sections of this paper is 2 hours. You are advised to spend approximately 70 minutes on this section. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Do all rough work in this book. Cross through any work you do not want to be marked. • Show all your working. Information • The marks for questions are shown in brackets. • The maximum mark for this paper is 45. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. * * IB/M/Jun22/E8 7408/3A Section A Answer all questions in this section. outside the box 0 1 Figure 1 shows apparatus used to measure the speed of sound in a steel rod. Figure 1 The steel rod is suspended from a beam using rubber bands. When the hammer is in contact with the end L of the steel rod, a circuit is completed and the signal generator is connected to the oscilloscope. Figure 2 shows the waveform then displayed on the oscilloscope. Figure 2 . Which control on the oscilloscope should be used to centre the trace vertically on the screen? Tick () one box. box [1 mark] X-shift Y-gain Y-shift Question 1 continues on the next page Turn over ► box . The distance between L and R in Figure 1 is 0.870 m. Deduce the speed of sound in the steel rod. [3 marks] box