Em Spectrum - Visible Light

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| Written by L-ionel

L-ionel

Community Contributor

Quizzes Created: 15 | Total Attempts: 6,348

Questions: 5 | Attempts: 2,269 | Updated: Mar 21, 2022

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This quiz will test your understand on Visible Light.

Questions and Answers

1.

Red has the shortest wavelength
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement "Red has the shortest wavelength" is false. In the visible light spectrum, red light has the longest wavelength, while violet light has the shortest wavelength. The order of the visible light spectrum from longest to shortest wavelength is: red, orange, yellow, green, blue, indigo, and violet.

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3
2.

Violet has the longest wavelength
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement "Violet has the longest wavelength" is incorrect. In the visible light spectrum, violet light actually has the shortest wavelength. The colors in the visible light spectrum are arranged in increasing order of wavelength, with red having the longest wavelength and violet having the shortest.

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3.

When all the waves are seen together, they make black light.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement "When all the waves are seen together, they make black light" is incorrect. When all the waves are seen together, they make white light, not black light. White light is a combination of all visible colors of light, while black light is the absence of light or the complete absence of any color.

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4.

Visible light rays cannot be seen by the naked eye.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Visible light rays can be seen by the naked eye. Visible light refers to the range of electromagnetic radiation that is visible to humans. It includes the colors of the rainbow, such as red, orange, yellow, green, blue, indigo, and violet. These colors can be seen by the naked eye when light enters the eye and is detected by the photoreceptor cells in the retina. Therefore, the statement that visible light rays cannot be seen by the naked eye is false.

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5.

How many colours are there in the spectrum?
- A.
  
  4
- B.
  
  8
- C.
  
  7
Correct Answer
C. 7

Explanation
The spectrum refers to the range of colors that are visible to the human eye when white light is passed through a prism. This range consists of seven colors: red, orange, yellow, green, blue, indigo, and violet. Therefore, the correct answer is 7.

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Em Spectrum - Visible Light

Red has the shortest wavelength

Violet has the longest wavelength

When all the waves are seen together, they make black light.

Visible light rays cannot be seen by the naked eye.

How many colours are there in the spectrum?