Question

when a beam of light is passed through organic liquids such as benzene ,toluene,etc ,the scattered light contained other frequencies in addition to that of incident light.Why does it happens?

Answer 1

It is all due to the Raman effect. The scattering of light by the particles of a medium resulting in change in frequency and wavelength of the scattered wave is called Raman Effect. The line spectrum of the scattered light will have one prominent line corresponding to the original wavelength of the incident radiation. Also additional lines appear each side of it corresponding to the shorter or longer wavelengths of the scattered light.