# Energy transfer by heating

### Description

GCSE Physics Flashcards on Energy transfer by heating, created by nadine pownall on 05/18/2016.
Flashcards by nadine pownall, updated more than 1 year ago
 Created by nadine pownall over 8 years ago
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## Resource summary

 Question Answer How does the temperature of an object affect the rate at which it emits infrared radiation ? The hight the temperature of the object, the greater the rate at which it emits infrared radiation. What is a vacuum ? A vacuum is a region that doesn't contain anything, even gas particles. Why are houses in hot countries often painted white ? Houses in hot countries are often painted white as white is the worst absorber of infrared radiation. Why are the pipes at the back of a fridge often painted black ? The pipes at the back of a fridge is often painted black as black is the best emitter of infrared radiation. How is the arrangement of the particles in a liquid different from that in a solid ? The particles in a liquid are in contact with each other but are not held together in fixed positions like those in a solid. How is the arrangement of the particles in a gas different from that in a liquid ? The particles in a gas are much more further apart and move alot more faster than those in a liquid. Why are saucepans often made of metal with wooden handles ? The metal base of a saucepan is a good conductor of heat, so heat is conducted quickly to the food in the pan. The wooden handle is a poor conductor, and so prevents any one picking it up from getting burnt. Why are materials that trap air good insulators ? Air is a poor conductor, so materials that trap air are good insulators. Why doesn't convection occur in solids ? Convection doesn't occur in solids as the particles are held together in fixed positions and so are not able to flow. Why does a fluid become less dense when it is heated ? A fluid becomes less dense when it is heated, because it expands, so there is the same mass of material in a larger volume. What effect would decreasing the surface area of a liquid have on the rate of evaporation ? Decreasing the surface area of a liquid would decrease the rate of evaporation. What effect would decreasing the surface area of a liquid have on its rate of condensation ? Decreasing the surface area would decrease the rate of condensation. Why does painting an object dull black maximise the rate of energy transfer ? Painting an object dull black maximises the rate of energy transfer, because dull black surfaces are the best emitters of radiation. Why does trapping air in small pockets minimise the rate of energy transfer ? Trapping air in small pockets will minimise the rate of energy transfer because convection currents cannot be set up. The specific heat capacity of oil is 2100 J/kg degrees C. How much energy is needed to raise the temperature of 1 kg of oil by 1 degrees C ? The energy needed is 2100 J. The specific heat capacity of water is 4200 J/kj degrees C. How much energy is needed to raise the temperature of 2kg of water by 1 degrees C ? The energy needed is 8400 J. Why is fibreglass a good insulator ? Fibreglass is a good insulator because it contains trapped air. Why are the pipes that contain the water in a solar heating panel often painted black ? The pipes that contain the water in a solar heating panel are often painted black because black is the best absorber of radiation.

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