Mark Scheme (Results) November 2009

Mark Scheme (Results) November 2009

IGCSE

IGCSE Physics (4420/2H)

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4420_2H Nov 2009

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November 2009 Publications Code UG022386 All the material in this publication is copyright ? Edexcel Ltd 2009

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The following abbreviations have been used:

ecf error carried forward

dop dependent on previous

owtte or words to that effect

ora or reverse argument

Question Number 1 (a)

Acceptable Answers

wire melts/blows breaks circuit/no current

Question Number 1 (b)

Acceptable Answers

Use of P = V I 1500 / 240 = 6.25 (A)

Question Number 1 (c)(i)

Acceptable Answers 13A

Question Number 1 (c)(ii)

Acceptable Answers all the others would blow dop

Question Number 1 (d)

Acceptable Answers

toaster / oven / kettle /bread machine /soldering iron etc.

Extra Information Extra Information

Mark

1 1

Mark

3

Extra Information

Mark 1

Extra Information

Mark 1

Extra Information not microwave

Mark 1

(Total 8 marks)

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Question Number 2 (a)(i)

2 (a)(ii)

2 (b)

2 (c)(i) Question Number 2 (c)(ii)

Acceptable Answers protons and neutrons/ Helium atom 2p + 2n /He nucleus/nuclei scores 2 another source of background radiation

less absorption/space less dense or vacuum owtte time for activity to halve owtte Acceptable Answers 1. method shown on graph 6 000 (years) 2. count similar to background/no (carbon-14) activity

Extra Information

Mark 2

buildings

1

rock

soil

nuclear power

medical uses

radon etc

1

Extra Information

1 Mark

1 1

1

Question Number 2 (c)(iii)

Acceptable Answers

smoke detector sterilising tracers checking welds cancer treatment etc

Extra Information

Mark 1

accept `medical'

(Total 9 marks)

2 4420_2H Nov 2009

Question Number 3 (a)

Acceptable Answers

force distance

direction

Question Number 3 (b)

Question Number 3 (c)(i)

3 (c)(ii)

Acceptable Answers

2000/ 5 = 400 (W)

Acceptable Answers

efficiency = useful output energy/

input energy

20 000/ 50 000 = 0.4 or 40%

Extra Information Mark

either order

1

1

1 independent marks

Extra Information Mark

1 1

Extra Information

Mark

= ( input energy ? waste

1

energy) / input energy

0.4 scores 3 (c) marks

1

1

(Total 8 marks)

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