EXPLANATION:
- According to Rayleigh's law of scattering, the intensity of light of wavelength
λ present in the scattered light is inversely proportional to the fourth power of
λ, provided the size of the scattering particles are much smaller than
λ. Mathematically, it is written as
I∝.
- The Raman effect is defined as the scattering of photons by the excited molecules that are at higher energy levels.
- Raman effect is also known as Raman scattering. - Raman effect, change in the wavelength of light that occurs when a light beam is deflected by molecules.
- When a beam of light traverses a dust-free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam.
- Most of this scattered light is of unchanged wavelength.
- A small part, however, has wavelengths different from that of the incident light its presence is a result of the Raman effect.
- The inelastic scattering of a photon by a molecule that is raised to higher energy levels is called the Raman Effect.
- Raman effect takes place when light enters a molecule and interacts with the electron density of the chemical bond causing electromagnetic field in the molecule leading to vibrational and deformation of frequency shift. Therefore option 2 is correct.
- When the light of a sufficiently small wavelength is incident on the metal surface, electrons are ejected from the metal instantly. This phenomenon is called the photoelectric effect.