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Semiconductor and Electronics

Semiconductor and Electronics Notes for Class 11 - 12 Learning Outcomes Explain band theory of solid materials Explain conductor, non-conductor, and semiconductor by band theory Explain intrinsic and extrinsic semiconductors Explain the concept of electron and hole in semiconductors Explain the p-type and n-type semiconductor Explain the construction and function of the junction diode Explain rectification Explain the construction and function of a junction transistor Explain the use of transistor as amplifier and switch Explain conversion of a different number system Explain Binary operation Analysis of the program of different logic gate Explain band theory of solid materials Energy Band:   There is a slight difference in the energy of electrons revolving in the same orbit in an atom of any matter. The range between the maximum and minimum energy level of these electrons situated in the same orbit is called the energy band. The energy level and energy band are not the same. The energ

Contributions of Jagadish Chandra Bose

Contributions of Jagadish Chandra Bose


Acharya Sir Jagadish Chandra Bose was a renowned physicist, as well as a successful biologist. He was the first internationally recognized scientist of this subcontinent. The forefathers of Jagadishchandra Bose lived at the village of Rarikhal of Bikrampur in Dhaka district. He was born in 1858 in Mymensingh. His father, Bhagaban Chandra Bose, was a deputy magistrate of the Faridpur district.

Acharya Sir Jagadish Chandra Bose

His education started in a rural school in Faridpur. Later he completed his studies at Hare School and Saint Xavier School and College in Kolkata. After passing his B.A. in 1880, he went to England, and from 1880 - 1884 he completed his honors with BA in Physics from Cambridge University and then acquired a B.Sc. degree from London University. Returning to his motherland in 1885, he became a professor of physics in Presidency College. At that time was not enough scopes for research in that colleges, but he continued his research anyway. He was always busy during the day. So, he carried on his research at night.

He conducted a lot of research on how to send radio signals without electric wires. In 1895, for the first time, he sent a wireless radio signal to distant places and demonstrated this publicity. He has great contributions to microwave research; he was the first to reduce the wavelength of the electromagnetic wave to the order of millimeters (nearly 5 mm). Acharya Jagadish Chandra Bose used semiconductor junctions to direct radio signals. Instead of patenting this invention and obtaining commercial benefits from it, he opened it for all.

In later years, Jagadish Chandra Bose discovered many important aspects of plant physiology. Among those, the invention of the Cresco graph to record the growth of plants, detecting very minor movements, and matters of responding to various stimuli are worth mentioning. Earlier it was assumed that response to stimuli was a chemical process. He showed that it was actually electrical in nature.

In 1917 he established the Bose Biggan Mandir in Kolkata for research on plant physiology. The writings of Jagadish Chandra Bose in Bengali were compiled in a book named 'Obyakto'. A significant book of his is 'Response in the living and nonliving.' On 23 November 1937, scholar Jagadish Chandra Bose breathed his last.

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