Titlebook: Work Out Physics GCSE; John Keighley Textbook 1990Latest edition Macmillan Publishers Limited 1990 energy.General Certificate of Secondary

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Macmillan Publishers Limited 1990

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Expansion, Gas Laws and Kinetic Theory,Gases, solids and liquids usually expand when heated. For a given temperature rise, gases expand more than liquids and liquids expand more than solids. Water has the unusual property of contracting as it is heated from 0 °C to 4 °C; it has its maximum density at 4 °C.

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Heat and Change Of State,If a large saucepan full of water is heated and a small saucepan full of water is supplied with the same amount of heat energy, then the temperature of the water in the smaller saucepan rises more than the temperature of the water in the large saucepan. Heat is a form of energy (unit: J) and temperature is the degree of hotness (unit: °C or K).

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Transfer of Heat,Heat energy may be transferred from one place to another by conduction, convection and radiation.

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Optics,The angle of incidence is equal to the angle of reflection (fig. 1).

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Wave Motion,In all wave motion, a disturbance (energy) travels through a medium without the medium moving bodily with it. The wave transmits energy from the source to the receiver.