physics 1A 0.0 / 5 ? SciencePhysicsGCSEAQA Created by: nadeen2000Created on: 30-04-17 17:30 which surfaces are good absorbers and emmiters of infrared radiation? dark and matte surfaces 1 of 15 which surfaces are poor absorbers and poor emitters of infrared radiation? light and shiny surfaces 2 of 15 what is convection? the transfer of particles with a lot of heat energy taking the place of particles with less heat energy involving a liquid and a gas 3 of 15 what is condensation? gas changes to liquid- particles bond together energy is released 4 of 15 what is evaporation? liquid changes to gas- particles have low kinetic energy levels so liquid cools and evaporation happens 5 of 15 what is conduction? movement of heat transfer from place to place 6 of 15 which surfaces are good reflectors of infrared radiation? light and shiny surfaces 7 of 15 what is a U value? measures how good of an insulator a material is- the lower the U value the better the insulator 8 of 15 name 3 things which an object energy transfer by heat depends on? surface area, volume and the material of the object 9 of 15 what is meant by the term payback time? how cost effective an appliance is 10 of 15 what is the equation for energy transferred from the mains? E=PXT 11 of 15 what is the equation for calculating the efficiency of a device? efficiency= useful energy out/total energy in x 100 12 of 15 what are the units for energy ? Kwh 13 of 15 what are the units for power? Kw 14 of 15 what are the units for time? H 15 of 15
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