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GCE

Physics A
Advanced GCE H558
Advanced Subsidiary GCE H158



Mark Schemes for the Units

January 2010




H158/H558/MS/10J
Oxford Cambridge and RSA Examinations

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OCR (Oxford Cambridge and RSA) is a leading UK awarding body, providing a wide range of
qualifications to meet the needs of pupils of all ages and abilities. OCR qualifications include
AS/A Levels, Diplomas, GCSEs, OCR Nationals, Functional Skills, Key Skills, Entry
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CONTENTS


Advanced GCE Physics A (H558)

Advanced Subsidiary GCE Physics (H158)



MARK SCHEMES FOR THE UNITS


Unit/Content Page

G481 Mechanics 1

G482 Electrons, Waves and Photons 8

G484 The Newtonian World 14

Grade Thresholds 19

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G481 Mark Scheme January 2010


G481 Mechanics

Question Expected Answers Marks Additional Guidance
1 (a) Correct lines from: B2 Note: 2 marks for all correct
joule (J) to N m 1 mark for two correct
watt (W) to J s-1 0 marks for none or one correct
newton (N) to…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
-2
2 (a) W mg Allow: Use of 9.8 (m s )
weight 1.50 9.81 14.72 (N) or 14. 7 (N) or 15 (N) B1 Allow: Bald 15 (N); but not `1.50 10 = 15(N)'


(b) (i) Net /…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
3 (a) mass = 140 3.0 (= 420 kg) B1 420
Allow: 140 (reverse argument)
3.0

(b) (i) total mass = 500 + 560 + 420 (= 1480 kg) C1 Note:
Omitting one of the masses ­ can score…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
4 (a) The mass (of the electron) increases M1 Not: mass `changes' / `electron becomes heavier'
as its speed approaches c / speed of light / 3 108 A1
m s-1
(b) (i) A line with correct arrow in…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
5 (a) Energy cannot be created or destroyed; it can only Allow: `Energy cannot be created / destroyed / lost'
be transferred/transformed into other forms B1
or
The (total) energy of a system remains constant
or
(total) initial energy…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
6 (a) The graph shows length and not extension of the B1 Allow: `length cannot be zero'
spring / spring has original length (of 2.0 cm) (AW)

(b) Straight line (graph) / linear graph / force extension / B1…

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G481 Mark Scheme January 2010


Question Expected Answers Marks Additional Guidance
7 (a) (i) It has maximum / large / increased stress at this B1 Allow: it has `same force but thinner/smaller area'
point Not: Thin / small area
(ii) The tape has (permanent) extension / deformation B1 Note: Need…

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