Why sky is blue?what is Raman effect
Answers
Why sky is blue?
During the daytime, sunlight travels through a thin layer of atmosphere. Red and orange light are scattered the least by tiny particles because its wavelength is the longest. Violet and blue light are scattered the most by tiny particles because its wavelength is the shortest. This gives the sky its blue appearance. Violet light is not seen because our eyes are more sensitive to blue light. Hence more blue light enters our eyes.
What is 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. This Raman spectrum is characteristic of the transmitting substance. Raman spectrometry is a useful technique in the characterization of materials.
The light from the Sun looks white. But it is really made up of all the colors of the rainbow. When white light shines through a prism, the light is separated into all its colors. A prism is a specially shaped crystal. Like energy passing through the ocean, light energy travels in waves, too. Some light travels in short, "choppy" waves. Other light travels in long, lazy waves. Blue light waves are shorter than red light waves.
It is a phenomenon in which change in the wavelength of light occurs when a beam of light is deflected by molecules. When a beam of light travels from a dust-free transparent sample of a chemical compound, then a small fraction of the light emerges in the direction other than that of the incident light. Most of the scattered light wavelength is unchanged and in small part, if the wavelength is different from that of incident light it is due to Raman Effect.
