A-level PHYSICS Paper 3 Section A

A-level PHYSICS Paper 3 Section A Thursday 15 June 2023 Morning 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/Jun23/E10 7408/3A Section A Answer all questions in this section. outside the box A stroboscope emits bright flashes of white light. The duration of each flash and the frequency of the flashes can be varied. Table 1 shows information about the stroboscope. Table 1 Minimum Maximum Duration of each flash / μs 60 300 Frequency of flashes / Hz 1 150 The duration of each flash is T1. The time from the start of a flash to the start of the next flash is T2. The duty cycle of a stroboscope is defined as T1 . T2 . What is the maximum duty cycle of the stroboscope? Tick () one box. [1 mark] 6.0 × 10−5 3.0 × 10−4 9.0 × 10−3 4.5 × 10−2