Which of the following statements is not valid for the scattering of light?

(a) Colour of the scattered light depends on the size of particles in the atmosphere.

(b) Red light is least scattered in the atmosphere.

(c) Scattering of light takes place as various colours of white light travel with different speed in air.

(d) The fine particles in the atmospheric air scatter the blue, light more strongly than red. So the scattered blue light enters our eyes.

Solution,
Scattering of light takes place when the size of the scatterer is comparable to the wavelength of light.
The scattering of light is inversely proportional to the fourth power of the incident wavelength.
Thus, the higher the wavelength, the lower the scattered intensity. Thus, In the case of white light, red light is scattered less while blue light is scattered the most.
Thus, options (a), (b) and (d) are correct. 
All wavelengths is a white light travels with the same velocity hence option (c) is False.
 

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