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AQA-7408-3BB-PHYSICS QUESTION PAPER 3 SECTION B:Medical physics-A LEVEL-17Jun24-AM

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AQA-7408-3BB-PHYSICS QUESTION PAPER 3 SECTION B:Medical physics-A LEVEL-17Jun24-AM. 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 000002 Page 2 of 12 PHYSICS 3 *03* Turn over ► IB/M/Jun24/7408/3BB Do not write outside the 0 2 box . 1 A stadium is full of spectators. The peak sound-intensity level at the centre of the 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 000003 Page 3 of 12 PHYSICS 4 *04* IB/M/Jun24/7408/3BB Do not write outside the 0 3 box . 1 Name the two types of optical fibre bundle used in an endoscope. 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] 000004 Page 4 of 12 PHYSI

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AQA
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A-level
PHYSICS

S
Paper 3
Section B Medical physics
IC
Monday 17 June 2024 Morning Time allowed: The total time for
YS
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.
PH


• 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
Page 1 of 12

, 000002

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]




S
IC power = D
YS
0 1 . 3 An eye with astigmatism requires the following prescription:

−4.00 –0.75 ×30

Which row identifies the meaning of each number?
PH


Tick () one box.
[1 mark]

−4.00 −0.75 ×30

axis cylinder spherical

cylinder axis spherical

spherical cylinder axis

cylinder spherical axis 4




*02*
IB/M/Jun24/7408/3BB
Page 2 of 12

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