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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
both sections of this paper is
Materials
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
both sections of this paper is
Materials
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
