Discussion
Most of the light re-emitted at the same wavelength as the incident light is called as :
Answer: B
It is called Rayleigh scattering.
When light passes through a sample, most of the scattered light comes out at exactly the incident wavelength, because the photons exchange no energy with the molecules; this elastic scattering is Rayleigh scattering. Its strength varies as 1/λ4, which is why the sky is blue.
A very small fraction, roughly one photon in a million, is scattered inelastically, gaining or losing a vibrational or rotational quantum. That is Raman scattering. Its lines at lower frequency (the molecule gains energy) are the Stokes lines, and those at higher frequency (the molecule gives up energy) are the anti-Stokes lines. None of these is at the incident wavelength.
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