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What is energy measured in?
Joules (J)
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Can energy appear or dissappear?
No. When anything happens, energy is transferred from one place to another.
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What type of surfaces are the best at absorbing infrared radiation?
Black matt surfaces
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What type of surfaces are the best at reflecting infrared radiation?
Shiny light coloured surfaces
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Do hotter surfaces emit radiation faster or slower than cooler surfaces?
Faster
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Do cooler surfaces emit radiation faster or slower than hotter surfaces?
Slower
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What happens if infrared radiation is emitted faster than it is absorbed?
The object cools down
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What happens if infrared radiation is absorbed faster than it is absorbed?
The object warms up
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What happens (in terms of particles) when something melts?
When the solid is heated, particles vibrate more vigorously, bonds between particles break and reform so particles can change places.
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What happens (in terms of particles) when something boils?
The particles break their bonds and can move around randomly.
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Describe the particles in a solid.
In solids, particles vibrate and are held together by strong bonds.
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Describe the particles in a liquid.
In liquids, particles move around each other but cannot escape due to weak bonds.
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Describe the particles in a gas.
In gases, particles move randomly as the bonds are very weak.
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Why are metals good conductors?
Electrons in metas are free to move rapidly from hotter to cooler regions, transferring energy.
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Describe conduction.
If one end of a solid is heated,particles vibrate more and shake their neighbours. Conduction transfers energy from one particle to another through the solid
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Describe convection.
If one part of a liquid or gas is warmed, the particles vibrate more taking up more space. The warm region of gas or liquid expands, becoming less dense and rising above cooler denser regions.
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What do convection currents do?
They spread heat through liquids or gases that are heated from the base, or cooled from the top.
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Other cards in this set

Card 2

Front

Can energy appear or dissappear?

Back

No. When anything happens, energy is transferred from one place to another.

Card 3

Front

What type of surfaces are the best at absorbing infrared radiation?

Back

Preview of the front of card 3

Card 4

Front

What type of surfaces are the best at reflecting infrared radiation?

Back

Preview of the front of card 4

Card 5

Front

Do hotter surfaces emit radiation faster or slower than cooler surfaces?

Back

Preview of the front of card 5
View more cards

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