Heat Radiation Flashcards

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1
Q

What does heat energy do?

A

It tends to flow away from hotter objects to its cooler surroundings.

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2
Q

How many ways is heat transferred?

A

3 different ways.

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3
Q

Name the 3 ways heat energy is transferred.

A

Radiation.
Conduction.
Convection.

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4
Q

What is heat radiation?

A

The transfer of heat energy by infrared radiation.

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5
Q

What does conduction and convection involve?

A

The transfer of energy by particles.

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6
Q

What is conduction?

A

The main form of heat transfer in solids.

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7
Q

What is convection?

A

The main form of heat transfer in liquids and gases.

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8
Q

What can infrared radiation be emitted by?

A

Solids.
Liquids.
Gases.

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9
Q

What can any object do?

A

Emit or absorb infrared radiation, whether or not conduction or convection are also taking place.

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10
Q

The bigger the temperature difference between a body and its surroundings the what?

A

The faster energy is transferred by heating.

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11
Q

What are all objects continually doing?

A

Emitting and absorbing infrared radiation.

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12
Q

Where is infrared radiation emitted from?

A

The surface of an object.

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13
Q

What object emits more radiation than it absorbs?

A

An object which is hotter than its surroundings.

As it cools down.

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14
Q

What object absorbs more radiation than it emits?

A

An object which is cooler than its surroundings.

As it warms up.

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15
Q

The hotter an object is the…

A

More radiation it radiates in a given time.

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16
Q

When can you feel infrared radiation?

A

If you stand near something hot

Eg fire or touch the bonnet of a recently parked car.

17
Q

What does radiation depend on?

A

Surface colour.

Texture.

18
Q

What surfaces absorb infrared radiation?

A

Dark.

Matt.

19
Q

What surfaces emit more infrared radiation?

A

Light.
Shiny.
Gloss white or silver.

20
Q

Light. shiny surfaces do what?

A

Reflect a lot of infrared radiation falling on them.

21
Q

Give an example of something which emits infrared radiation?

A

Vacuum flasks.

Silver inner surface to keep heat in or out depending on whether its storing hot or cold liquid.

22
Q

What do solar hot water panels contain?

A

Water pipes uder a black surface.

23
Q

Radiation from the sun does what?

A

Its absorbed by the black surface to heat the water in the pipes.

24
Q

The water can be used for what?

A

Washing.

Pumped into radiators to heat buildings.