# Physics Mark Scheme

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS

MARK SCHEME for the May/June 2007 question paper

9702 PHYSICS
9702/02 Paper 2 (AS Structured Questions), maximum raw mark 60

This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination.

CIE will not enter into discussions or correspondence in connection with these mark schemes.

CIE is publishing the mark schemes for the May/June 2007 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

Page 2

Mark Scheme GCE A/AS LEVEL – May/June 2007

Syllabus 9702

Paper 2 B2

1

(a) (i) all positions (accept 20, 40, 60, 80) marked to within ±5° positions are 40°, 70°, 90° and 102° (-1 for each error or omission) (ii) allow 107° → 113° (b) e.g. more sensitive at low volumes (do not allow reference to ‘accuracy’)

B1 B1

[3] [1]

2

(a) force per unit positive charge (on a small test charge) (b) field strength = (210/{1.5 × 10-2} =) 1.4 ×104 N C-1 (c) (i) acceleration = Eq / m = (1.4 × 104 × 1.6 × 10-19) / (9.1 × 10-31) = 2.5 × 1015 m s-2 (2.46 × 1015) towards positive plate / upwards (and normal to plate) (ii) time = 2.4 × 10-9 s (d) either vertical displacement after acceleration for 2.4 × 10-9 s = ½ × 2.46 × 1015 × (2.4 × 10-9)2 = 7.1 × 10-3 m (0.71 cm < 0.75 cm and) so will pass between plates i.e. valid conclusion based on a

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