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In this lesson, we will learn how to describe how the temperature of an object and its surface features affect the object's emission and absorption of infrared radiation.
Which color of a surface makes it better at emitting and absorbing infrared radiation,
black or white?
A Leslie cube is a hollow watertight aluminum cube that has vertical faces, each with a
particular color and reflectivity, as shown in the table. How well each face of the cube emits
infrared radiation can be tested by filling the cube with boiling water and aligning an
infrared sensor with each face of the cube, each the same distance from the cube, several
centimeters away from it.
Thermometers are placed in contact with each face. Which of the following options correctly
describes the thermometers’ temperature readings?
Which face of the cube produces the highest reading on an infrared sensor?
Which face of the cube produces the lowest reading on an infrared sensor?
Which emits and absorbs infrared radiation
more easily, a strongly reflective or a weakly reflective surface?
A planet in orbit around a star absorbs infrared radiation from it. The average power of
the infrared radiation on the planet’s surface is
450 W/m2 and the average
surface temperature of the planet is a constant
. The planet’s
total surface area is
m2. How many watts of infrared
radiation does the planet emit?
An object that is
reflective absorbs infrared radiation better than if it had any
other reflectivity. An object that is
reflective emits radiation better than if it had
any other reflectivity.
An object that is colored
absorbs infrared radiation better than if it were any other color. An object that is colored
emits infrared radiation better than if it were any other color.
A plastic block is placed in constant intensity sunlight and absorbs infrared radiation. During the block’s exposure to sunlight, its temperature decreases. Which of the following statements is correct?
The graph of intensity of emitted light at different wavelengths is shown for three objects A, B, and C that have different
temperatures but equal surface areas and all have the same color and reflectivity. The visible
wavelengths of light are shown on the graph by their associated colors.
Which object emits the most red light compared to any other wavelength of electromagnetic
radiation that it emits?
Which object emits the least red light compared to any other visible color that it emits?
Which object emits more infrared radiation than any visible color that it emits?
Which object has the highest temperature?
Which object emits the most infrared radiation?
A metal can is placed in constant intensity sunlight and absorbs infrared radiation. During
the can’s exposure to sunlight, the temperature of the metal increases. Which of the
following statements is correct?
of the following properties of objects does not directly affect the amount of infrared
radiation it emits and absorbs?
A satellite orbiting Earth is initially in Earth’s shadow. As the satellite moves
around Earth, it passes into a part of its orbit where it is exposed to sunlight, as shown
in the diagram. The satellite reaches thermal equilibrium before it passes back into
Earth’s shadow. Which pair of the following sketch graphs most correctly show how
both the infrared radiation emitted by the satellite and the satellite’s temperature
change while it travels through the sunlit space?
A bottle containing water is placed in constant-intensity sunlight and absorbs infrared
radiation. During the bottle’s exposure to sunlight, the temperature of the water remains
constant. Which of the following statements is correct?
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