physics

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  • Created by: Dymphna
  • Created on: 17-04-13 17:04
describe infrared radiation
electromagnetic waves between visible light and microwaves in the electromagnetic spectrum.
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what surfaces are good absorbers of infrared radiation?
dark surfaces.
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what surfaces are good reflectors of infrared radiation?
light, shiny surfaces.
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what surfaces are good emitters of infrared radiation?
dark surfaces.
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what happens to infrared radiation in a vacuum?
it travels through it.
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what happens to infrared radiation when an object gets hotter?
the hotter the object, the more infrared radiation it emitts.
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describe the three states of matter.
solid-particles side by side. liquid-particles close but free to move still. gas-particles far apart.
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describe the movement of the particles in the three states of matter.
solid-particles vibrate about fixed positions so it has a fixed shape. liquid-particles are in contact but can move about at random so doesnt have fixed shape and can flow. gas-particles are far apart so doesnt have a fixed shape.
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describe the transfer of energy by conduction.
usually occurs in solids. one end of solid is heated and end particles gain kinetic energy and begin to vibrate causing the energy to be passed through each particle until solid is heated up.
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describe the transfer of energy by convection.
this usually occurs in liquids. when a liquid is heated it expands which makes the liquid less dense and rise. the warm liquid is replaced by cooler liquid and results in a convection current which transfers energy throughout liquid.
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describe the transfer of energy by evapouration.
evapouration occurs when the most energetic liquid molecules escape from the liquids surface and enter the air.
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describe the transfer of energy by condensation.
condensation is when gas particles cool down after reaching a cold surface.
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what factors affect the rate of evapouration and condensation?
surface area, temperature.
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what three factors affects the rate at which an object transfers energy?
material of object, objects shape, objects surface area.
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what do u values tell us?
how much energy passes through material per second.
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how do we use water filled solar panels?
the sun heats the panels and the water inside. the water may then be used to heat buildings or provide domestic hot water.
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what is specific heat capacity?
amount of energy required to raise the temperature of 1 kilogram of the substance by 1 degree celcius.
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describe how a house may be insulated.
fibre glass loft insulation, cavity wall insulation, double glazing, draught proofing, aluminium foil behind radiators.
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what is payback time?
time taken for something to produce savings to match how much it cost.
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name eight forms of energy.
kinetic, nuclear, electrical, gravitational potential, elastic potential, chemical, light and sound.
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name three forms of stored energy.
gravitational potential, elastic potential and chemical.
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how do you calculate efficiency of an appliance?
efficiancy=useful energy transferred by the appliance divided by total energy supplied to the appliance times by 100(%)
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what happens to wasted energy?
transferred to its surroundings to warm them up.
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what units are used to measure energy?
joules(J)
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what are the units of power?
watt(W)
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what is the power efficiency equation?
efficiancy=useful power out divided by total power in times by 100(%)
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Other cards in this set

Card 2

Front

what surfaces are good absorbers of infrared radiation?

Back

dark surfaces.

Card 3

Front

what surfaces are good reflectors of infrared radiation?

Back

Preview of the front of card 3

Card 4

Front

what surfaces are good emitters of infrared radiation?

Back

Preview of the front of card 4

Card 5

Front

what happens to infrared radiation in a vacuum?

Back

Preview of the front of card 5
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