Uncategorized

Chandrasekhara Venkata Raman was an Indian physicist who won Nobel Prize in Physics for his research in the field of light scattering popularly know as Raman Effect in 1930.

In 1986, the Government of India designated February 28^th as National Science Day to commemorate the announcement of the discovery of the “Raman effect”.

What is Raman Effect ?

When a stream of light passes through a liquid medium, most of the light emerging from the liquid sample is the same color as the incident beam, the so called Rayleigh scattered light.

However, in 1928, Raman discovered that a fraction of the light particles scattered by the liquid is of a different colour( and different wavelength, frequency). It happens because the liquid molecule either takes up energy from or gives up energy to the light particles/ photons, which are thereby scattered with decreased or increased energy and hence with lower or higher wavelength and frequency.

Subsequently, Raman was also able to prove that the blue colour of the ocean water was due to the scattering of the sunlight by water molecules.

It is to be notes here that Raman Effect is a very weak effect. Only one in a million of the scattered light particles actually exhibits the change in wavelength and frequency.

Vinayak Damodar Savarkar, popularly called as Veer Savarkar was born on 28 May 1883 near Nasik in Maharashtra.

He was a great freedom fighter. He was the first person who called the 1857 revolt as the first war of independence .

He founded Abhinav Bharat Society (In Pune) and Free India Society (In London).

His important literary works are ‘Joseph Mazzini- Biography and Politics‘ , ‘The Indian War of Independence‘ and ‘Hindutva: who is hindu?‘.

He served as the president of Hindu Mahasabha from 1937 to 1943. He was also an active member of India House founded by Shyamji Krishna Varma in London.

In his honour the Port Blair airport has been named as Veer Savarkar International Airport.

Dushman ki goliyon ka hum samna karenge, Azad hi rahein hain, azad hi rahenge!

Chandra Shekhar Azad was an Indian revolutionary leader who was born on July 23, 1906. He was popularly known as Azad.

Chandra Shekhar Azad was deeply saddened by massacre of the Jallianwala Bagh which took place in 1919. It was after this incident, he decided to join the Non-Cooperation movement led by Mahatma Gandhi in 1920 . He was only 15 years old when he got arrested for the first time.

He organised the Hindustan Socialist Republican Army (HSRA) in 1924 and became very famous for the Kakori Train robbery in 1925 and the killing of Saunders in 1928.

He had vowed that he would never be arrested by the British police and kept his promise by using his last bullet to shoot himself than be arrested. He died on 27 February 1931 at Azad Park in Allahabad while fighting with the police.