National Science Day (NSD) 2023
National Science Day (NSD) 2023 has been celebrated across the country on 28 February. National Science Day is being celebrated every year since 1986.
- The theme of National Science Day, 2023 is “Global Science for Global Wellbeing”.
- It may be noted that in the year 1928, on February 28 itself, Nobel laureate physicist CV Raman had announced the discovery of the Raman effect.
- The Raman effect is also called Raman scattering. He received the Nobel Prize in Physics in 1930.
- He was awarded the Bharat Ratna, India’s highest civilian honour, in the year 1954. He was the first Asian and the first black person to receive the Nobel Prize in Science.
- The Raman’s effect refers to the change in wavelength of light. This change occurs after the light beam is deflected by the molecules.
- When a ray of light passes through a dust-free and transparent medium of a chemical compound, a small fraction of the light is scattered in directions other than the direct direction of the incoming (incident) ray.
- The majority of this scattered light is of unchanged wavelength. However, a small portion has a wavelength different from that of the incident light. This is due to the Raman effect phenomenon.
Importance of Raman effect-
- Raman spectroscopy is used to identify and analyze the chemical composition of a substance.
- This is important for quantum theory.
- It is used in remote sensing and planetary exploration.
Other Contributions of C.V. Raman:
- The Indian Journal of Physics was started in 1926.
- The Raman Research Institute was established in Bangalore in 1948.
Source – PIB
