Physics 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: tayla15Created on: 08-04-14 15:26 how does temperature affect the rate of infrared radiation greater the heat the more radiation it emmits 1 of 15 what is a vacuum its a region that contains nothing, not even gas particles 2 of 15 why are houses in hot places often painted white white is the worst heat absorber 3 of 15 why are the pipes on the back of the fridge matte black because matte black is the best infrared emitting colour 4 of 15 the difference between solid, liquid, & gas particles gas=far apart, liquid=in contact but still able to move, solid=compact 5 of 15 why are saucepans often made of metal with wooden handles metal base= good heat conductor & wood handles stay cool to hold 6 of 15 why are materials that trap air good insulators air is a bad conductor, therefore materials that trap air are good insulators 7 of 15 why doesnt convection occur in solids convection doesnt occur in solids as the particles are in fixed positions 8 of 15 why do fluids become less dense when heated because it expands, so there is the same mass but a larger surface area 9 of 15 what effect does decreasing the surface area of a liquid have on its evaporation rate decreasing the surface area would decrease the evaporation rate 10 of 15 what affect would decreasing the surface ara of a liquid have on its rate of condensation decreasing the surface area would decrease the condensation rate 11 of 15 why does painting an object dull black maximise the rate of energy transfer it maximises the rate of energy transfer as dull black is the best emmiter of infrared radiation 12 of 15 why does trapping air in small pockets minimise the rate of energy transfer it minimises it as convection currents cant be set up 13 of 15 why is fibreglass a good insulator it is good as it contains trapped air which is key to a good insulator 14 of 15 why are the pipes that contain the water in a solar heating panel often painted black because black is the best absorber of radiation 15 of 15
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