A-level
PHYSICS
Paper 3
Section B Electronics
Monday 17 June 2024 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.
• Fi...
Monday 17 June 2024 Time allowed: The total
time for both sections of
Morning this paper is
Materials
2 hours. You are
For this paper you must have: advised to spend
a pencil and a ruler approximately
a scientific calculator
a Data and Formulae Booklet
50 minutes on this section.
a protractor.
For Examiner’s Use
Instructions
Use black ink or black ball-point pen. Question Mark
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 Information
3
not write outside the box around each page or on blank The marks for
pages. 4questions are shown
If you need extra space for your answer(s), use the lined pages at 5in brackets.
the end of this book. Write the question number against your The maximum mark
answer(s). TOTAL
for this paper is 35.
Do all rough work in this book. Cross through any work you do You are expected to
not want to be marked. use a scientific
Show all your working. calculator where
appropriate.
Paper 3 physics
,Paper 3 physics
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun24/E8
7408/3BE
Paper 3 physics
, 2
Do not write
Section B outside the
box
Answer all questions in this
section.
0 1 A toy manufacturer is designing a two-tone siren for use in small
battery-operated cars.
Figure 1 shows design Option 1.
Option 1 uses three separate signal generators feeding into a logic sub-
system. The signal generators produce logic-compatible 9 V square
waves of frequencies 1024 Hz, 1 Hz and 512 Hz.
Figure 1
The waveforms shown are not to scale.
0 1
. 1 Explain how the logic level applied at B in Figure 1 determines the output
frequency at Q.
[2 marks]
0 1 . 2 Write the Boolean algebra expression for output Q in terms of the inputs A,
B and C.
Use only the logic operations shown in Figure 1.
[2 marks]
Q=
IB/M/
Jun24/7408/3BE
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