CBSE Class 12 Physics Notes, Free PDF download of CBSE Class 12 Physics revision notes and short key-notes to score more marks in your exams, prepared by our expert Physics teachers from the latest edition of CBSE (NCERT) books.

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Saturday, April 4, 2020

Raman Effect by Sir C.V. Raman


RAMAN EFFECT :   When a strong beam of visible or ultraviolet spectral light falls on a gas , a liquid or a transparent solid , a small fraction of light is scattered in all directions.The spectrum of this scattered light consist of the lines of the same frequency as the incident beam as well as some weak lines of changed frequencies.The original lines are called as RAYLEIGH LINES,while those of changed frequencies are known as RAMAN LINES.The Raman lines corresponding to each Rayleigh line are found to be symmetrically situated on both sides of Rayleigh line. The lines found on the low frequency side of exciting ling are known as Stokes lines , while on high frequency side are termed as anti-stokes lines. The anti-stokes Raman lines are much weaker than the stokes lines. The effect was observed by Sir C.V. Raman in 1928 and hence,it is called Raman effect after his name.

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