Physics Paper

Topics: Energy, Electromagnetic radiation, Insulated glazing Pages: 12 (2304 words) Published: May 20, 2013
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General Certificate of Secondary Education Higher Tier June 2012

1 2 3 4 5 6 7 8 TOTAL

Science A
Unit Physics P1

PH1HP

Physics
Unit Physics P1 Wednesday 20 June 2012 9.00 am to 10.00 am

H

For this paper you must have:  a ruler  the Physics Equations Sheet (enclosed). You may use a calculator.

(JUn12PH1Hp01)

G/K83986

6/6/6/6

PH1HP

2 Answer all questions in the spaces provided.

Do not write outside the box

1

A wood burning stove is used to heat a room.

The fire in the stove uses wood as a fuel. The fire heats the matt black metal case of the stove. 1 (a) The air next to the stove is warmed by infrared radiation. How does the design of the stove help to improve the rate of energy transfer by infrared radiation? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (2 marks)

(02)

G/K83986/Jun12/PH1HP

3 1 (b) Burning 1 kg of wood transfers 15 MJ of energy to the stove. The stove then transfers 13.5 MJ of energy to the room. Calculate the efficiency of the stove. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Efficiency = ........................................ (2 marks) 1 (c) Some of the energy from the burning wood is wasted as the hot gases leave the chimney and warm the air outside the house. Name one other way energy is wasted by the stove. ............................................................................................................................................ (1 mark) 1 (d) Some people heat their homes using electric heaters. Other people heat their homes using a wood burning stove. Give two environmental advantages of using a wood burning stove to heat a home rather than heaters that use electricity generated from fossil fuels. 1 ............................................................................................................................................