Energy transfer

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What is the best colour for a central heating radiator, glossy white or dull black?
Dull black
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Why does a solid have a fixed volume?
Because the particles are held together in fixed positions.
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When a liquid evaporates, why does the average kinetic energy of the remaining molecules reduce?
The most energetic molecules leave the liquid.
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What happens to the rate of energy transfer between an object and its surroundings if the temperature difference between them is reduced?
The rate of energy transfer decreases.
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Which types of energy transfer involves particles?
Conduction, convection and evaporation involve particles.
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How does energy from the sun reach the earth?
Energy from the sun reaches the earth as radiation that travels through space.
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How does the colour of a surface affect the rate of conduction?
The colour of the surface has no effect on the rate of conduction.
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Why are gases poor conductors?
Gases are poor conductors because the particles are far apart.
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Why are metals the best conductors?
Metals are the best conductors because they have free electrons.
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What is convection?
Convection is the movement of energy through a fluid by movement of the fluid itself.
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How does the cavity wall insulation reduce the energy transfer from a house?
Cavity wall insulation traps the air in the cavity in pockets, preventing convection currents from being set up.
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Why are the pipes on the back of a fridge usually painted black?
Black surfaces are the best emitters of infrared radiation.
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What is a vacuum?
A region that doesn't contain anything at all, even gas particles.
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What effect would decreasing the surface area of a liquid have on its rate of evaporation?
It would decrease the rate of evaporation.
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Why does a fluid become less dense when it's heated?
It expands, so it is the same mass of material in a larger volume.
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Why is fibreglass a good insulator?
It contains trapped air.
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Other cards in this set

Card 2

Front

Why does a solid have a fixed volume?

Back

Because the particles are held together in fixed positions.

Card 3

Front

When a liquid evaporates, why does the average kinetic energy of the remaining molecules reduce?

Back

Preview of the front of card 3

Card 4

Front

What happens to the rate of energy transfer between an object and its surroundings if the temperature difference between them is reduced?

Back

Preview of the front of card 4

Card 5

Front

Which types of energy transfer involves particles?

Back

Preview of the front of card 5
View more cards

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