Jamai Sasthi

Acharya Jagadish Chandra Bose

Jagadish Chandra Bose was a physicist and botanist Indian, pioneer of radio. Born in Bengal now Bangladesh during the British government, was the son of a magistrate. At nine years old he was sent to study in Calcutta. He had as teachers Jesuit Father Eugene Lafont, who played an important role to develop his interest in the natural sciences, and the son of Charles Darwin, Francis Darwin.

After graduating in 1879, in 1880 he went to England, where he joined the faculty of medicine of the ' University of London. Health problems, in particular the crisis of malaria forced him to interrupt his studies. The following year, his condition improved and he enrolled at Christ's College in Cambridge to study physics. Among his teachers prestigious names such as John Rayleigh , James Dewar , Michael Foster and Francis Darwin.

After obtaining a degree at Cambridge he returned to Calcutta, where he obtained a position as a teacher at Presidency College , which he held for thirty years. He had among his pupils Satyendra Nath Bose, who later became famous for his discoveries of nuclear physics.

From 1894 to 1900 Bose conducted a series of experiments on the propagation of electromagnetic waves . In November 1894 he made ​​the first practical demonstration of the transmission of such waves, sounding an alarm at a distance and causing the explosion of an explosive charge with a radio signal. Guglielmo Marconi will make his first experiment in 1897 in England. During his experiments Bose produced waves of 5 mm, studying the reflection, diffraction and polarization. He used the galena to build a diode semiconductor primitive, which used it as a collector of radio waves.

Sir Nevill Francis Mott , Nobel Prize for physics in 1977, wrote that Chandra Bose was 60 years in advance of his time and, in fact, created the first semiconductor type-P and type-N.

After the 1900 Bose changed his research interests, moving toward the plant physiology . In this field produced pioneering work on plant growth and their reactions in the presence of electromagnetic fields. He created a tool called crescograph , who used to accurately estimate the rate of growth of the plants, capable of expanding up to 10,000 times the observed changes in growth.

He received numerous awards, including in 1903 the Companionship of the British Empire (CBE) and in 1915 the Companionship of the Stars of India (CSI). He retired from teaching in 1915, but he had another five years for the title of Professor Emeritus. In 1916 he was awarded by the British Government the title of Sir.