Worksheet: Infrared Radiation

In this worksheet, we will practice describing how the temperature of an object and its surface features affect the object's emission and absorption of infrared radiation.

Q1:

Which color of a surface makes it better at emitting and absorbing infrared radiation, black or white?

  • A Black
  • B White

Q2:

Which emits and absorbs infrared radiation more easily, a strongly reflective or a weakly reflective surface?

  • AA weakly reflective
  • BA strongly reflective

Q3:

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?

  • AThe plastic loses exactly as much energy by cooling as the energy of the infrared radiation that it absorbs.
  • BThe plastic absorbs more energy from infrared radiation than the energy it loses by cooling.
  • CThe plastic does not receive any energy from the sunlight.
  • DThe plastic loses more energy by cooling than the energy of the infrared radiation that it absorbs.
  • EInfrared radiation absorption and emission have no effect on temperature.

Q4:

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 3 3 C . The planet’s total surface area is 5 × 1 0 1 2 m2. How many watts of infrared radiation does the planet emit?

  • A 9 × 1 0 1 3 W
  • B 1 . 1 1 × 1 0 1 0 W
  • C 2 . 5 2 × 1 0 1 5 W
  • D 2 . 2 5 × 1 0 1 5 W

Q5:

Which of the following properties of objects does not directly affect the amount of infrared radiation it emits and absorbs?

  • ASurface area
  • BColor
  • CReflectiveness
  • DMass
  • ETemperature

Q6:

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?

  • AThe metal does not receive any energy from the sunlight.
  • BThe metal loses exactly as much energy by cooling as the energy of the infrared radiation that it absorbs.
  • CThe metal loses more energy by cooling than the energy of the infrared radiation that it absorbs.
  • DThe metal absorbs more energy from infrared radiation than the energy it loses by cooling.
  • EInfrared radiation absorption and emission have no effect on temperature.

Q7:

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?

  • AThe water loses more energy by cooling than the energy of the infrared radiation that it absorbs.
  • BThe water does not receive any energy from the sunlight.
  • CThe water absorbs more energy from infrared radiation than the energy it loses by cooling.
  • DThe water loses exactly as much energy by cooling as the energy of the infrared radiation that it absorbs.
  • EInfrared radiation absorption and emission have no effect on temperature.

Q8:

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.

  • Astrongly, weakly
  • Bweakly, strongly
  • Cstrongly, strongly
  • Dweakly, weakly

Q9:

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.

  • Awhite, black
  • Bblack, white
  • Cwhite, white
  • Dblack, black

Q10:

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.

Cube Face Color Reflectivity
A Black High
B Black Low
C White High
D White Low

Thermometers are placed in contact with each face. Which of the following options correctly describes the thermometers’ temperature readings?

  • AThe thermometers on faces A and C read the same temperature.
  • BThe thermometers on faces A and B read the same temperature.
  • CAll the thermometers read different temperatures.
  • DAll the thermometers read the same temperature.

Which face of the cube produces the highest reading on an infrared sensor?

  • AFace D
  • BFace C
  • CFace A
  • DFace B

Which face of the cube produces the lowest reading on an infrared sensor?

  • AFace C
  • BFace A
  • CFace B
  • DFace D

Q11:

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?

  • A Object C
  • B Object A
  • C Object B

Which object emits the least red light compared to any other visible color that it emits?

  • A Object A
  • B Object B
  • C Object C

Which object emits more infrared radiation than any visible color that it emits?

  • A Object A
  • B Object B
  • C Object C

Which object has the highest temperature?

  • A Object A
  • B Object B
  • C Object C

Which object emits the most infrared radiation?

  • A Object A
  • B Object C
  • C Object B

Q12:

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 (B) and (H)
  • B (A) and (E)
  • C (C) and (G)
  • D (C) and (E)
  • E (D) and (G)

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