P2.5 Energy transfers: radiation Flashcards

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1
Q

What is infrared radiation?

A

Infrared radiation is radiation given off by the Sun and other objects that brings about energy transfer.

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2
Q

What do both light and infrared radiation travel as?

A

Both light and infrared radiation travel as waves.

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3
Q

What kind of radiation does the Sun emit?

A

The Sun emits many different kinds of radiation, including light and infrared radiation.

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4
Q

What do you need to transfer energy by conduction or convection?

A

You need particles to transfer energy by conduction or by convection.

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5
Q

Do you need particles to transfer energy by radiation?

A

You do not need particles to transfer energy by radiation.

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6
Q

What do you not need to transfer infrared radiation that you need to transfer energy by conduction or convection?

A

You do not need particles to transfer energy by radiation but you need them to transfer energy by conduction or convection.

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7
Q

What is a vacuum?

A

A vacuum is a space completely devoid of matter.

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8
Q

Name an example of a vacuum.

A

For example, space is a vacuum.

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9
Q

What is there none of in a vacuum?

A

There are no particles (or matter) in a vacuum.

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10
Q

What does the type of radiation that an object emit depend on?

A

The type of radiation that an object emits depends on their temperature.

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11
Q

What does the amount of radiation an object emits per second depend on?

A

How much radiation an object emits per second depends on the type of surface.

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12
Q

Just like light, infrared can be transmitted, reflected and _.

A

Just like light, infrared can be transmitted, reflected and absorbed.

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13
Q

What is a thermal imaging camera?

A

A thermal imaging camera absorbs infrared and produces an image. The colours in the image are ‘false’. The camera works out which areas are hotter and shows them redder in the image.

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14
Q

What does a remote thermometer do?

A

A remote thermometer contains a sensor that detects infrared. It uses the radiation to work out the temperature.

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15
Q

Do dark colours absorb or reflect infrared?

A

Dark colours absorb infrared.

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16
Q

Do light colours/ shiny surfaces absorb or reflect infrared?

A

Light colours/ shiny surfaces reflects infrared.

17
Q

What kind of surfaces reflects infrared?

A

Light colours or shiny surfaces reflect infrared.

18
Q

What kind of surfaces absorbs infrared?

A

Dark colours absorb infrared.

19
Q

What does light travel through to reach Earth?

A

Light travels through space to reach Earth.