Mark Scheme (Results) January 2013 - Edexcel

Mark Scheme (Results)

January 2013

International GCSE Physics (4PH0) Paper 1P Science Double Award (4SC0) Paper 1P Edexcel Level 1/Level 2 Certificate Physics (KPH0) Paper 1P Science (Double Award) (KSC0) Paper 1P

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January 2013 Publications Code UG034793 All the material in this publication is copyright ? Pearson Education Ltd 2013

Question number 1 (a) (i) C - 14

Answer

Notes

Marks 1

(ii) B - 8

1

(iii) A - 6

1

(b)

A - An electron

1

(c)

A - 1.5 g

1

(d)

Atoms/nuclei with same number of protons / same

1

atomic number / same element;

ALLOW `different mass' for second mark if it's

clear they are comparing atoms within the

Different numbers of neutrons / different mass

same element rather than different elements

1

number / different atomic mass;

IGNORE references to electrons if possible, but if candidates makes an incorrect reference to electrons then list principle applies for that mark (e.g 'same number of protons but different number of neutrons and electrons' = 1)

Total 7

Question number 2 (a) (i)

(ii)

Answer

Equal to Any TWO of Rays continued and reflected correctly from mirror;

Projected back behind mirror (to reasonably the right place) Line perpendicular to the mirror joining object and image positions (roughly equal distances in front and behind);

Notes

Judged by eye to be i = r rays should diverge after reflection Judged by eye ACCEPT (for the second mark) projection back to image even if reflected rays not drawn in front of the mirror

Marks

1 2

Rays do not need to have arrows Dotted lines no required behind mirror Image does not have to be labelled Accept dotted lines in front of mirror if meaning is clear Use of ruler not essential, but candidates will find it difficult to draw a convincing diagram freehand

(iii) 'rays do not actually meet at the image'

1

Question Number 2 (b) (i)

Answer

Added to diagram Reflection inside fibre; At least three (with reasonable angles);

(ii) Must be more (optically) dense to less (optically) dense change; Angle of incidence > critical angle;

(iii) Any ONE sensible point ? e.g. Less prone to noise; less prone to heating; send more information (per second); more data (per second);

Notes

Marks

Continuous path shown inside fibre

1

1

IGNORE angle of incidence = critical angle

1

DO NOT ALLOW angle of incidence greater than

420

1

IGNORE references to cost

1

IGNORE references to speed

Total 9

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