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A-level
PHYSICS
Paper 3
Section A
Thursday 15 June 2023 Morning Time allowed: The total time for
Materials
both sections of this paper is
For this paper you must have: 2 hours. You are advised to
• a pencil and a ruler spend approximately
• a scientific calculator
• a Data and Formulae Booklet 70 minutes on this section.
• a protractor.
For Examiner’s Use
Instructions
Question Mark
• Use black ink or black ball-point pen.
• Fill in the boxes at the top of this page. 1
• Answer all questions. 2
• You must answer the questions in the spaces provided. Do not write 3
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 TOTAL
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.
*JUN2374083A01*
IB/M/Jun23/E10 7408/3A
, 2
Do not write
outside the
Section A box
Answer all questions in this section.
0 1 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.
T1
The duty cycle of a stroboscope is defined as .
T2
0 1 . 1 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
*02*
IB/M/Jun23/7408/3A
, 3
Do not write
outside the
0 1 . 2 Figure 1 shows images produced in an experiment in which a bouncing ball is box
illuminated by a stroboscope.
The stroboscope flashes at a constant frequency.
Figure 1
Suggest why T1 must be very short for this experiment.
[1 mark]
Question 1 continues on the next page
Turn over ►
*03*
IB/M/Jun23/7408/3A
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