Worksheet: Colors of Light

In this worksheet, we will practice describing the reflection, transmission, absorption of light of different colors, and the relation between colors and light wavelengths.

Q1:

An object is struck by a beam of white light containing all the colors of the visible spectrum, as shown in the diagram. Some colors are reflected from the object, some are transmitted through the object, and some are absorbed by the object. Assume that all the colors of light in the beam contain the same amount of energy as each other.

What percentage of the energy in the incident light ray does the object reflect? Answer to one decimal place.

  • A30%
  • B20%
  • C28.6%
  • D71.4%
  • E12%

What percentage of the energy in the incident light ray does the object absorb? Answer to one decimal place.

  • A20%
  • B71.4%
  • C57.1%
  • D42.9%
  • E28.6%

What color will an object that emits only red, orange, and yellow light appear if viewed through the shown object?

  • AYellow
  • BOrange
  • CGreen
  • DRed
  • EViolet

What color will an object that emits only red, orange, and yellow light appear if viewed reflected from the object?

  • AOrange
  • BYellow
  • CViolet
  • DGreen
  • ERed

Q2:

A light ray that strikes an object is partly reflected and partly transmitted, as shown in the diagram. What percentage of the light ray’s energy is absorbed by the object?

  • A15%
  • B50%
  • C85%
  • D65%
  • E35%

Q3:

What color is a beam of originally white light after the beam is both transmitted through object B and then reflected from object A?

  • ABlue
  • BGreen
  • CRed
  • DOrange
  • EYellow

Q4:

A white object emits white light that contains all the colors of the visible spectrum. What color is the image of the white object seen as after the light from it is both transmitted through object A and then reflected from object B?

  • ABlue
  • BRed
  • CYellow
  • DOrange
  • EGreen

Q5:

The visible light spectrum is shown in the diagram. πœ†οŠ§ and πœ†οŠ¨ are the longest and shortest visible wavelengths.

What is πœ†οŠ§ in nanometers?

  • A 600 nm
  • B 900 nm
  • C 700 nm
  • D 400 nm
  • E 200 nm

What is πœ†οŠ¨ in nanometers?

  • A 100 nm
  • B 500 nm
  • C 300 nm
  • D 700 nm
  • E 400 nm

Q6:

Different colors of light correspond to different wavelengths of light. The waves shown in the diagram are of blue, orange, green, red, and indigo light, so they have different wavelengths from each other.

Which color of light is shown with a much longer wavelength than it would actually have, compared to the other colors of light shown?

  • AIndigo
  • BRed
  • CBlue
  • DGreen
  • EOrange

Which color of light is shown with a much shorter wavelength than it would actually have, compared to the other colors of light shown?

  • AOrange
  • BRed
  • CBlue
  • DGreen
  • EIndigo

Q7:

An object appears blue in color when seen in sunlight. The same object is illuminated by a mixture of equally bright red and green light and is viewed through a blue filter. In what color does the object appear?

  • ABlue
  • BWhite
  • CRed
  • DBlack
  • EGreen

Q8:

A rock made of an unknown material is seen as green in color when white light from the Sun shines on it. The rock is taken to a lightless room in which the rock cannot be seen. Red light is then reflected from the rock, which is now seen as black in color. The rock also appears black in color when violet light is shone on it. When the rock is returned to a sunlit environment, it is again seen as green-colored. Which of the following statements most correctly explains the apparent changes in the color of the rock?

  • AThe rock only absorbs green light.
  • BWhen the rock absorbed sunlight, this altered the color of the rock.
  • CWhen the rock was removed from sunlight, this altered the color of the rock.
  • DThe rock only reflects green light.

Q9:

A rock is black in color. When electromagnetic radiation above visible frequencies is shone on the rock, the rock is seen as blue in color. The rock appears the same blue color regardless of whether there is any visible light in its surroundings. Which of the following statements most correctly explains the apparent changes in the color of the rock?

  • AThe rock absorbs only blue light.
  • BThe rock does not reflect any visible light.
  • CThe rock reflects all colors of light.
  • DThe rock reflects only blue light.

Q10:

An object appears black in color when seen in sunlight. The same object is illuminated by a mixture of equally bright orange and yellow light and is viewed through a red filter. In what color does the object appear?

  • AOrange
  • BRed
  • CBlack
  • DYellow
  • EWhite

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