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Worksheet: Colors of Light

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%
  • B12%
  • C71.4%
  • D28.6%
  • E20%

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

  • A42.9%
  • B71.4%
  • C28.6%
  • D57.1%
  • E20%

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

  • AViolet
  • BOrange
  • CRed
  • DYellow
  • EGreen

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

  • AOrange
  • BGreen
  • CViolet
  • DRed
  • EYellow

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%
  • B35%
  • C65%
  • D50%
  • E85%

Q3:

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?

  • AGreen
  • BBlue
  • CRed
  • DYellow
  • EOrange

Q4:

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?

  • AGreen
  • BOrange
  • CRed
  • DBlue
  • EIndigo

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

  • ARed
  • BIndigo
  • CBlue
  • DGreen
  • EGreen

Q5:

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

  • AYellow
  • BGreen
  • COrange
  • DBlue
  • ERed

Q6:

The visible light spectrum is shown in the diagram. πœ† 1 and πœ† 2 are the longest and shortest visible wavelengths.

What is πœ† 1 in nanometers?

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

What is πœ† 2 in nanometers?

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