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abc
General Certificate of Education


Applied Science
8771/8773/8776/8779

SC08 Medical Physics



Mark Scheme
2007 examination - January series

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Mark schemes are prepared by the Principal Examiner and considered, together with the
relevant questions, by a panel of subject teachers. This mark scheme includes any
amendments made at the standardisation meeting attended by all examiners and is the scheme
which was used by them in this examination. The standardisation…

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Applied Science - AQA GCE Mark Scheme 2007 January series




Question 1

(a) Uses (conductive) gel (1)(AO1) 1
Any two of: (one mark each) (2)(AO2)
· Interference
(b) 2
· Movement produces electrical impulses
· Electrical impulses in nerves/muscles
(c)(i) Theta (1)(AO1) 1
(ii) Mental activity (1)(AO1) 1
(iii) Deep…

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Applied Science - AQA GCE Mark Scheme 2007 January series




Question 3

Time taken for half the radioactive
(a)(i) 1
Nuclei present to decay (or wtte) (1)(AO1)
0.125g (2)(AO2)
1 compensation mark for either:
(ii) 2
· 4 half lives
· correct use of iterative method
Any two clear points…

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Applied Science - AQA GCE Mark Scheme 2007 January series




Question 4

1.35 Allow 1.3 ­ 1.4 (3)(AO2)
Allow 1 mark compensation for:
(a) Correct equation 3
Correct substitution or correct use of sines
Maximum 2 compensation marks
Correct diagram showing ray
(b)(i) · emerging into the air (1)(AO2) 2…

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Applied Science - AQA GCE Mark Scheme 2007 January series




Question 6

(a)(i) Above normal (1)(AO1) 1
(145) Systolic/in systole (or wtte) (1)(AO1)
(ii) 2
(90) Diastolic/in diastole (or wtte) (1)(AO1)
Any suitable advantage for 1 mark e.g. (1)(AO1)
· Less chance of infection
Any suitable disadvantage for 1 mark…

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