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Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Medical physics
Monday 17 June 2024 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 50 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.
4
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). 5
Do all rough work in this book. Cross through any work you do not want TOTAL
to be marked.
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun24/E8 7408/3BB
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 . 1 A human eye has a far point of 6.0 m.
State the name of this defect of vision.
[1 mark]
0 1 . 2 Calculate the power of the correcting lens required for this eye.
[2 marks]
power = D
0 1 . 3 An eye with astigmatism requires the following prescription:
−4.00 –0.75 ×30
Which row identifies the meaning of each number?
Tick () one box.
[1 mark]
−4.00 −0.75 ×30
axis cylinder spherical
cylinder axis spherical
spherical cylinder axis
cylinder spherical axis 4
IB/M/Jun24/7408/3BB
, 3
Do not write
outside the
0 2 . 1 A stadium is full of spectators. The peak sound-intensity level at the centre of the box
stadium is 110 dB.
On another occasion the number of spectators in the stadium is reduced by 60%.
Estimate the peak sound-intensity level at the centre of the stadium.
You should assume that on both occasions:
the sound intensity produced by each spectator is the same
the spectators are distributed evenly around the stadium.
[4 marks]
peak sound-intensity level = dB
0 2
. 2 Describe the changes to a person’s hearing that may result from prolonged exposure
to sound at 110 dB.
[2 marks]
6
Turn over ►
IB/M/Jun24/7408/3BB
, 4
Do not write
outside the
0 3 . 1 Name the two types of optical fibre bundle used in an endoscope. box
Go on to discuss whether the optical fibres in either of these bundles require cladding.
[4 marks]
0 3 . 2 Modal and material dispersion can cause problems in fibre-optic communications.
Discuss why the methods used to reduce modal and material dispersion are not
required in an endoscope.
In your answer you should:
describe the methods used to reduce dispersion in an optical fibre used for
communication
explain why the methods are not required in an endoscope
explain how using these methods in an endoscope would affect its function.
[6 marks]
IB/M/Jun24/7408/3BB
Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatu re
I declare this is my own work.
A-level
PHYSICS
Paper 3
Section B Medical physics
Monday 17 June 2024 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 50 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.
4
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). 5
Do all rough work in this book. Cross through any work you do not want TOTAL
to be marked.
Show all your working.
Information
The marks for questions are shown in brackets.
The maximum mark for this paper is 35.
You are expected to use a scientific calculator where appropriate.
A Data and Formulae Booklet is provided as a loose insert.
IB/M/Jun24/E8 7408/3BB
, 2
Do not write
outside the
Section B box
Answer all questions in this section.
0 1 . 1 A human eye has a far point of 6.0 m.
State the name of this defect of vision.
[1 mark]
0 1 . 2 Calculate the power of the correcting lens required for this eye.
[2 marks]
power = D
0 1 . 3 An eye with astigmatism requires the following prescription:
−4.00 –0.75 ×30
Which row identifies the meaning of each number?
Tick () one box.
[1 mark]
−4.00 −0.75 ×30
axis cylinder spherical
cylinder axis spherical
spherical cylinder axis
cylinder spherical axis 4
IB/M/Jun24/7408/3BB
, 3
Do not write
outside the
0 2 . 1 A stadium is full of spectators. The peak sound-intensity level at the centre of the box
stadium is 110 dB.
On another occasion the number of spectators in the stadium is reduced by 60%.
Estimate the peak sound-intensity level at the centre of the stadium.
You should assume that on both occasions:
the sound intensity produced by each spectator is the same
the spectators are distributed evenly around the stadium.
[4 marks]
peak sound-intensity level = dB
0 2
. 2 Describe the changes to a person’s hearing that may result from prolonged exposure
to sound at 110 dB.
[2 marks]
6
Turn over ►
IB/M/Jun24/7408/3BB
, 4
Do not write
outside the
0 3 . 1 Name the two types of optical fibre bundle used in an endoscope. box
Go on to discuss whether the optical fibres in either of these bundles require cladding.
[4 marks]
0 3 . 2 Modal and material dispersion can cause problems in fibre-optic communications.
Discuss why the methods used to reduce modal and material dispersion are not
required in an endoscope.
In your answer you should:
describe the methods used to reduce dispersion in an optical fibre used for
communication
explain why the methods are not required in an endoscope
explain how using these methods in an endoscope would affect its function.
[6 marks]
IB/M/Jun24/7408/3BB
