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Senior High School: 11th and 12th Grade
Physics
Physics - Infrared Radiation
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Q.1
Thermal radiation can only travel through which substances?
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Solids
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Liquids
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Gases
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Transparent and translucent substances
Q.2
The inside container of a thermos bottle is silvered. Why?
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To reduce heat loss by radiation
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To completely prevent heat loss by radiation
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To reduce heat loss by evaporation
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To reduce heat loss by condensation
Q.3
Which of the following does use infrared radiation?
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Security lamps
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A head torch
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A remote control for a TV
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An intruder alarm
Q.4
Which one of the following emits the most infrared radiation?
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1 kg of water at 95oC
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1 kg of iron at 68oC
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1 kg of your body at 37oC
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1 kg of crude oil at 72oC
Q.5
In an electric toaster, what methods of heat transfer cook the bread?
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Mainly radiation with some conduction
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Mainly conduction and some radiation
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Conduction and convection only
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Mainly convection but conduction has a part to play too
Q.6
Thermal radiation travels at what speed?
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Very slowly
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Instantaneously
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The speed of sound
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The speed of light
Q.7
Put the following in order of best to worst of infrared radiation:Red, dullWhite, shinyBlack, dullRed, shiny
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1, 3, 4, 2
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2, 4, 1, 3
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1, 2, 3, 4
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4, 1, 3, 2
Q.8
Why are car radiators often painted matt black?
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So that splashes of engine oil won't show up
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To make them more efficient
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To make the car more attractive to buyers
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It is a legal requirement
Q.9
Which are the best emitters of thermal radiation?
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Black, dull surfaces
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Light colored dull surfaces
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Black shiny surfaces
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Light colored shiny surfaces
Q.10
In sunny countries, houses are often painted white. Why?
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Painting them white lowers the U-value of the walls
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White paint does not conduct heat
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White is a good reflector of thermal radiation
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The white paint reflects the light into the narrow streets which otherwise would be dark
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