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AQA AS PHYSICS 7407/2 Paper 2 Question Paper + Mark scheme (Merged) GRADE A+

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AQA AS PHYSICS 7407/2 Paper 2 Question Paper + Mark scheme (Merged) June 2021 Version: 1.0 Final *JUN217407201* IB/M/Jun21/E7 7407/2 For Examiner’s Use Question Mark 1 2 3 4 5 6–35 TOTAL 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. • 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 70. • You are expected to use a scientific calculator where appropriate. • A Data and Formulae Booklet is provided as a loose insert. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. AS PHYSICS Paper 2 Time allowed: 1 hour 30 minutes You are advised to spend about 35 minutes on Section C 2 *02* IB/M/Jun21/7407/2 Do not write outside the box Section A Answer all questions in this section. 0 1 A student investigates stationary waves using microwaves. Figure 1 shows a metre ruler fixed to a bench. The student places a microwave transmitter T at one end of the ruler and a vertical metal reflector R at the other end. R is at a right angle to the ruler. Figure 1 The student places a microwave detector D approximately one-third of the distance from T to R. When T is switched off, the microammeter connected to D reads zero. When T is switched on, stationary waves are produced between T and R, and the microammeter registers a current. When the student moves D along the ruler, the size of the current changes between maximum and minimum values. 3 *03* Turn over ► IB/M/Jun21/7407/2 Do not write outside the box The student measures the current at different positions of D along the ruler to identify a position P of the minimum current. Figure 2 is a plot of the measurements taken near P. Figure 2 0 1 . 1 Draw a line of best fit for these data. [2 marks] 0 1 . 2 State a value for the position of P. [1 mark] position of P = cm Question 1 continues on the next page 4 *04* IB/M/Jun21/7407/2 Do not write outside the box The student moves D along the metre ruler towards R and observes a series of maximum and minimum readings on the microammeter. He identifies Q as the position of the 8th minimum current from P. He measures the distance PQ to be 50.9 cm, as shown in Figure 3. Figure 3 0 1 . 3 The absolute uncertainty in identifying any minimum current is ± 0.2 cm. Determine the percentage uncertainty in the distance PQ. [2 marks] percentage uncertainty in PQ = % 0 1 . 4 Deduce the frequency of the microwaves produced by T. [3 marks] frequency = Hz 5 *05* Turn over ► IB/M/Jun21/7407/2 Do not write outside the box 0 1 . 5 Figure 4 shows D placed at a position where the current is a maximum. Figure 4 The student rotates D by 90°, without changing its distance from T, to the position shown in Figure 5. The current is now zero. Figure 5 State the property of microwaves that is shown by this change in current. [1 mark]

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