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Which Color has the Longest Wavelength?

  • A.Violet
  • B.Yellow
  • C.Red
  • D.White

Answer: C

Red has the longest wavelength of the visible colours.

The visible range runs from about 400 nm at the violet end to 700 nm at the red end, so red has the longest wavelength and, since \(E = hc/\lambda\), the lowest energy. White is not a spectral colour but a mixture of all of them.

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