Raman effect is due to Sir C.V. Raman. Which of the following statements is correct about the 'Raman effect'?
- AThe Raman effect is an example of elastic scattering of light.
- BThe frequency of scattered light increases and decreases after scattering.
- CThe frequency of incident light can only decrease after scattering.
- DNone of the above
Show answer and explanation
Correct answer: (b) The frequency of scattered light increases and decreases after scattering.
Explanation
In the Raman effect, a small part of the light scattered by a substance has a different frequency from the incident light: some lower and some higher.
It is inelastic scattering: energy is exchanged with the molecules. That rules out (a), and (c) is wrong because the frequency can also rise.