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Q: Which colour has the shortest wavelength?
  • A. Red
  • B. Orange
  • C. Blue
  • D. Purple
Correct Answer: Option D - Purple colour has a shortest wavelength and red has the longest wavelength, while the highest frequency is of purple and least of red colour in the visible light of spectrum.
D. Purple colour has a shortest wavelength and red has the longest wavelength, while the highest frequency is of purple and least of red colour in the visible light of spectrum.

Explanations:

Purple colour has a shortest wavelength and red has the longest wavelength, while the highest frequency is of purple and least of red colour in the visible light of spectrum.