GCSE physics- Heat radiation

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Flashcards by meggyloulou11, updated more than 1 year ago
meggyloulou11
Created by meggyloulou11 almost 7 years ago
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Page 12 of GCSE CGP AQA revision guide

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Question Answer
Heat energy can be transferred by conduction, convection and radiation. Heat radiation if the transfer of heat energy by infrared radiation.
Conduction and convection involve the transfer of heat energy by particles. Conduction is the main form on heat transfer in solids
Convection if the main form of heat transfer in liquids and gases. Infrared radiation can be emitted by solids liquids and gases.
Any object can absorb and emit infrared radiation, whether or not conduction or convection is taking place doesn't matter. The bigger the temperature difference between a body and its surroundings, the faster energy is transferred by heating.
Infrared radiation is emitted from the surface of an object. You can feel infrared radiation if you stand near something hot like a fire or recently parked car bonnet.
hot objects, cool surroundings emit more than absorb(cool down) Cool objects, hot surrounding absorb more(warm up)
The hotter an object is, the more radiation it radiates in a given time.
dark matt surfaces absorb infrared radiation better than light shiny surfaces. light shiny surfaces reflect infrared radiation
solar hot water panels contain water pipes under a black surface, the heat is absorbed and warms the water in the tank.
light and shiny objects reflect IR radiation and dark matt surfaces absorb it!!
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