CV Raman’s birth anniversary 2023: every year, on November 7, CV Raman’s birth anniversary is celebrated. He is popular for his Nobel Prize-winning theory known as the Raman effect. CV Raman became the second Indian to win the Nobel Prize after Rabindranath Tagore. Also, to celebrate the extraordinary discovery, November 28 is celebrated as National Science Day every year.
Learn more about the Raman effect here and learn other facts about the phenomenon this National Science Day!
What is the Raman effect?
- The Raman effect is a change in the wavelength of light that occurs when molecules reflect a beam of light.
- This is when a beam of light passes through a transparent sample of a chemical compound that is free of dust.
- Then, a small part of the light exits in directions other than the incident (incoming) beam.
- Most of that scattered light is of unchanged wavelength.
- After that, a small part appears that has wavelengths different from those of the incident light.
- This is the result of the Raman effect.
- In 1928, this phenomenon was named after the Indian physicist Sir Chandrasekhara Venkata Raman. It was he who first published observations of the effect.
- Austrian physicist Adolf Smekal theoretically described the effect in 1923.
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More about the Raman phenomenon
- The phenomenon was first noticed a week before Raman by Russian physicists Leonid Mandelstam and Grigory Landsberg.
- However, scientists did not publish their results until months after Raman.
- The Raman theory is one of the simplest to understand incident light, which consists of particles or photons (with energy proportional to frequency) striking the molecules of the sample.
Details about the Raman effect
- Although most encounters are elastic, photons are scattered within pristine energy and frequency.
- In some cases, the molecule takes energy from photons or gives energy to photons.
- They are then scattered with reduced or increased energy, i.e. with a lower or higher frequency.
- Frequency shifts are therefore measured based on the amount of energy involved in the transition between the initial and final stages of the scattering molecule.
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The point
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The Raman effect explains the inelastic scattering of light through a transition in the wavelength of light that occurs when molecules reflect a light beam after passing through a transparent medium.
The phenomenon explains how the wavelength of these scattered rays differs from the incident rays.
Several chemists around the world, including physicists, use Raman spectroscopy to obtain information about various materials and their tendency to scatter light.
dr. CV Raman discovered the life theory of the scattering of light or photons, the Raman effect on February 28, 1928. Raman along with KS Krishnan conducted this experiment and surprisingly did not share the prize, but is prominently mentioned even in the Nobel lecture.
About the biography of Raman
- National Science Day begins on February 28 to commemorate the discovery of the Raman effect by physicist CV Raman, who was awarded the Nobel Prize in Physics in 1930.
- He was the second Indian to win the Nobel Prize after Rabindranath Tagore.
- National Science Day aims to spread the message about the importance of science and its application among people.
- In 1986, the first National Science Day was observed on February 28, when the National Council for the Communication of Science and Technology demanded that Indian physicist Raman be honored.
- The day emphasizes on spreading awareness among people about the use and importance of science in everyday life and providing appropriate platforms of opportunities to those who want to pursue their career in research, science and technology.
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Categories: Optical Illusion
Source: newstars.edu.vn