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      Question

      Red light is used for signals because it has

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      A long wavelength Correct Answer Incorrect Answer
      B high intensity Correct Answer Incorrect Answer
      C high frequency Correct Answer Incorrect Answer
      D low refraction in the medium Correct Answer Incorrect Answer

      Solution

      Red is the international colour of stop signs and stop lights on highways and intersections because it is scattered the least by air molecules. The effect of scattering is inversely related to the fourth power of the wavelength of a colour. Red has the highest wavelength of all the colours and is able to travel the longest distance through fog, rain, and the alike.

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