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Q: Red light is used as signal for stop as it is visible from greater distances than other colours because of its:
  • A. smallest wavelength and low frequency compared to any other colour on visible spectrum
  • B. high frequency and small wavelength compared to any other colour on visible spectrum
  • C. longest wavelength and low frequency compared to any other colour on visible spectrum
  • D. longest wavelength and low frequency compared to any other colour on visible spectrum
Correct Answer: Option C - In traffic signals red colour light is used to stop vehicles because it is having longer wave length and low frequency compared to any other colour on visible spectrum. The colour which is having longer wavelength will undergo lesser scattering hence it is visible from a longer distance. So, red light is able to travel the longest distance through fog, rain and the alike.
C. In traffic signals red colour light is used to stop vehicles because it is having longer wave length and low frequency compared to any other colour on visible spectrum. The colour which is having longer wavelength will undergo lesser scattering hence it is visible from a longer distance. So, red light is able to travel the longest distance through fog, rain and the alike.

Explanations:

In traffic signals red colour light is used to stop vehicles because it is having longer wave length and low frequency compared to any other colour on visible spectrum. The colour which is having longer wavelength will undergo lesser scattering hence it is visible from a longer distance. So, red light is able to travel the longest distance through fog, rain and the alike.