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Question

The wavelength of red coloured light is almost    than that of blue colour.
a) triple b) double C) one fourth d) one third 


Solution

b)the wavelength of red coloured light is almost double than that of blue colour.
  Color Wavelength
Violet 380–450 nm
Blue 450–495 nm
Green 495–570 nm
Yellow 570–590 nm
Orange 590–620 nm
Red 620–750 nm

So wavelength of red coloured light =750 nm(highest)

So wavelength of blue coloured light =450 nm(lowest)

Ratio = 750/450= 1.7 which is approximately 2

So the wavelength of red coloured light is almost double than that of blue colour.
 

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