Physics

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  • Created by: Matty_G16
  • Created on: 19-05-16 12:01
What is infrared radiation?
Infrared radiation is energy transfer by electromagnteic waves.
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What is a vacuum?
A space entirely devoid of matter.
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Why are houses in hot countries often painted white?
White is the worst absorber of infrared radiation.
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Why are the pipes on the back of a fridge usually painted black?
Black surfaces are the best emitters of radiation.
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How is the arrangement of 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 in fixed positions like those in a solid.
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How is the arrangement of the particles in a gas different from that in a liquid?
The particles in a gas are much farther apart and move around much faster than those in a liquid.
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Why are saucepans often made of metal with wooden handles?
The metal base of a saucepan is a good conductor so heat is conducted quickly to the food in the pan. The wooden handle is a poor conductor so it prevents someone picking up the saucepan getting burnt.
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Why are materials that trap air good insulators?
Air is a poor conductor so materials that trap air are good insulators.
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Why doesn't convection occur in solids?
Convection does not occur in solids because the particles are held in fixed positions and not able to flow.
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Why does a fluid become less dense when it is heated?
A fluid becomes less dense when heated because it expands, so there is a same mass of material in a larger volume.
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What effect would decreasing the surface area of a liquid have on its rate of evaporation?
Decreasing the surface area of a liquid would decreas the rate of evaporation.
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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.
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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.
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Why does trapping air in small pockets minimise the rate of energy transfer?
Trapping air in small pockets minimises the rate of energy trnasfer because convection currents cannot be set up.
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The specific heat capacity of oil is 2100 J/kg*C. How much energy is needed to raise the temperature of 1 kg of oil by 1*C?
The energy needed is 2100 J.
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The specific heat capacity of water is 4200 J/kg*C. How much energy is needed to raise the temperature of 2 kg of water by 1*C?
The energy needed is 8400 J.
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Why is fibreglass a good insulator?
Fibreglass is a good insulator because it contains trapped air.
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Why are the pipes that contain the water in a solar heating panel often painted black?
The pipes that contain water in a solar heating panel are often painted black because black is the best absorber of radiation.
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Other cards in this set

Card 2

Front

What is a vacuum?

Back

A space entirely devoid of matter.

Card 3

Front

Why are houses in hot countries often painted white?

Back

Preview of the front of card 3

Card 4

Front

Why are the pipes on the back of a fridge usually painted black?

Back

Preview of the front of card 4

Card 5

Front

How is the arrangement of particles in a liquid different from that in a solid?

Back

Preview of the front of card 5
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