Radiation Heat

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Section

• 7.1
• 7.2
• 7.3
• 7.4
• 7.5

Sources of Radiation Heat are:

• sun
• fire
• a cup of hot tea
• a cup of cold tea
• all of the above

All objects hot or cold radiate heat depending on their temperature. Cold objects radiate less heat than hot objects. The heat radiated is

• electromagnetic waves
• heat waves
• convection heat
• conduction heat
• all of the above

Hot black objects radiate or emit _______ heat compared to shiny objects.

• more
• less
• the same amount of
• no
• cannot tell

Shiny objects ___________ heat by radiation than black objects at the same temperature.

• emit less

• absorb more

• emit more

• reflect less

• cannot tell

Objects that have a high radiant light absorption usually

• have a low heat emission
• have a dark mat color
• have a light shiny color
• are white

An emergency blanket is shiny and

• have a low heat emission
• have a dark mat color
• have a high heat emission
• have a light shiny color
• cannot tell

A thermal blanket is used to stay warm as shown below. The blanket

• reflects body heat and keeps it in.
• is shiny and does not radiate heat to the outside.
• keeps the heat in while not losing heat to the oustide
• all of the above

A radiator is used to heat a room. The radiator below

• would work better if it were painted white hence reflecting all the heat
• would work well because it is mat and black emitting heat radiation
• would work better if it where shiny black
• all of the above