Wed January 04, 2012 By:

sir if small partices scatter blue light then what does large partics scattr ???if red..then why whynot/ and white thn why why not??

Expert Reply
Wed January 04, 2012

Rayleigh scattering describes the elastic scattering of light by spheres which are much smaller than the wavelength of light. The intensity of the scattered radiation is given by

where R is the distance between the particle and the observer, ? is the scattering angle, n is the refractive index of the particle, and d is the diameter of the particle.

It can be seen from the above equation that Rayleigh scattering is strongly dependent upon the size of the particle and the wavelengths.
so if  d  is significant then intensity of scattering is so much that it appears white.
where as only for very small particles it is inversly proportional to thefourth power of wavelength of light.
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