AQA AS LEVEL PHYSICS Paper 2 2021 QP

AQA AS LEVEL PHYSICS Paper 2 2021 QP *JUN* 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 Section A box 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.