P7- Infrared Radiation Flashcards

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1
Q

What is infrared radiation?

A

Part of the electromagnetic spectrum, along with visible light. It has a longer wavelength than visible light waves.

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2
Q

Key points on infrared radiation:

A
  • The higher the temperature of an object, the more infrared radiation it emits in a given time.
  • An object that has a constant temperature emits radiation across a continuous range of wavelengths.
  • Black body radiation is radiation emitted by a body that absorbs all the radiation.
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3
Q

Factors that affect the temperature on earth from the rate of infrared radiation that is -

A
  • Reflected back into space
  • Absorbed by the earths surface and atmosphere
  • Emitted from the earths surface back into space.
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4
Q

How is global warming affected by radiation?

A

-Some gases in the atmosphere absorb longer wavelengths of infrared, stopping it leaving the earth. This radiation is then emitted back to the earths surface.

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5
Q

What type of surfaces are better at absorbing or reflecting infrared

A
  • Dull Matt dark surfaces are better absorbers.

- Light shiny surfaces are better reflectors

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6
Q

Why does the moons temperature vary so greatly

A

-It doesn’t have an atmosphere, so it is unable to block out or trap in infrared radiation.

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7
Q

What is heat?

A

-The amount of energy stored in an object or substance
Or
-The amount of energy transferred from one object to another.

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8
Q

What is temperature?

A

-The measure of how hot or cold something is due to energy stored or transferred to an object.

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9
Q

What is infrared radiation?

A

-A type of electromagnetic wave which transfers heat energy.

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10
Q

What is thermal imaging?

A
  • When an infrared camera detects heat emissions from an object and produces an image.
  • Yellow/orange means high levels of infrared.
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11
Q

What is the unit for specific heat capacity?

A

J/kg degrees C

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12
Q

What is the equation for specific heat capacity?

A

Number of joules of heat / mass (kg) X temp change

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13
Q

How does Wall cavity and loft insulation insulate the home?

A
  • Insulation materials are poor conductors of heat, therefore reducing heat loss by conduction.
  • They also prevent air circulation inside the cavity, reducing heat loss by confection.
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