aqa
Please write clearly in block capitals.
Centre Candidate
number number
Surname
Forename(s)
Candidate re
signatu
A-level
PHYSICS
Paper 3
Section A
7408/3A
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
Questio Mark
Use black ink or black ball-point pen. n
Fill in the boxes at the top of this page.
1
Answer all questions.
You must answer the questions in the spaces provided. Do 2
The maximum
not write outside the box around each page or on blank 3mark for this
pages. paper is 45.
TOTAL
If you need extra space for your answer(s), use the lined pages at You are expected
the end of this book. Write the question number against your to use a scientific
answer(s). calculator where
Do all rough work in this book. Cross through any work you do appropriate.
not want to be marked. A Data and
Show all your working. Formulae Booklet
is provided as a
Information loose insert.
The marks for questions are shown in brackets.
final
,final
, 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.
The duty cycle of a stroboscope is T1
.
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
, 3
Do not write
outside the
0 1 .2 Figure 1 shows images produced in an experiment in which a box
bouncing ball is 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 ►
Please write clearly in block capitals.
Centre Candidate
number number
Surname
Forename(s)
Candidate re
signatu
A-level
PHYSICS
Paper 3
Section A
7408/3A
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
Questio Mark
Use black ink or black ball-point pen. n
Fill in the boxes at the top of this page.
1
Answer all questions.
You must answer the questions in the spaces provided. Do 2
The maximum
not write outside the box around each page or on blank 3mark for this
pages. paper is 45.
TOTAL
If you need extra space for your answer(s), use the lined pages at You are expected
the end of this book. Write the question number against your to use a scientific
answer(s). calculator where
Do all rough work in this book. Cross through any work you do appropriate.
not want to be marked. A Data and
Show all your working. Formulae Booklet
is provided as a
Information loose insert.
The marks for questions are shown in brackets.
final
,final
, 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.
The duty cycle of a stroboscope is T1
.
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
, 3
Do not write
outside the
0 1 .2 Figure 1 shows images produced in an experiment in which a box
bouncing ball is 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 ►
