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Yogita Ingle 5 years, 7 months ago
- Bose had wanted to study medicine in the University of London but quit due to ill-health. He then studied Natural Sciences at Christ’s College, Cambridge University and passed out with a BA in Natural Sciences. He also secured a B.Sc. in 1884 and a D.Sc. in 1896 both from the University of London.
- Bose invented the Mercury Coherer which is a radio wave receiver. This device was used by Guglielmo Marconi to build a radio. Bose was thus a key figure in the invention of the modern radio and also in sonic technology.
- Bose contributed significantly to the development of remote wireless signalling. He was also one of the pioneers of wireless communications.
- He was denied access to labs due to his race at the University of Calcutta which he had joined as a Professor of Physics. He would then conduct experiments in his dwelling, a 24 sq.ft. room in Calcutta.
- In 1894, Bose demonstrated in Calcutta that communications signals can be transmitted without wires by sending electromagnetic waves 75 feet passing through walls and remotely ringing a bell and igniting some gunpowder.
- He was also a pioneer in the arena of microwave devices.
- Bose holds the first patent in the world for a solid-state diode detector used to detect electromagnetic waves. He was averse to all forms of patenting though and patented the diode only due to pressure from his colleagues.
- He could have earned a fortune had he patented his many inventions. He however, chose to make all his research public so that other researchers could carry out further research.
- Sir Neville Mott, British physicist and winner of the Nobel Prize in 1977 has remarked, “J.C. Bose was at least 60 years ahead of his time. In fact, he had anticipated the existence of P-type and N-type semiconductors.”
- Acharya Bose was also renowned for his work on the physiology of plants. He believed that plants could feel and were aware of their surroundings. He was the first person to prove that plants feel pain and understand affection. He demonstrated the electrical nature of plant stimuli (like wounds, chemical agents, etc.). He researched on the seasonal effect on plants and also the effect of chemical inhibitors and temperature on plants. Thus, he contributed significantly to agriculture also.
- He was also a science fiction writer in Bengali.
- Largely unaccredited for his work on radio communications until recently, there has been an understanding of his work and his contributions to the development of modern wireless communications in recent times. He is now regarded as one of the fathers of radio science.
- He is also the discoverer of millimetre length electromagnetic waves.
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Yogita Ingle 5 years, 7 months ago
Young’s double slit experiment (YDSE)
The Young’s experiment shows that matter and energy can display both wave and particle characteristics.
Purpose of double slit experiment is as follows:-
- In order to prove the wave nature of light.
- To explain the phenomenon of interference.
Two coherent sources of light were taken in order to maintain the 0 or constant phase difference between the sources of light.
- Experimental set-up1:-
- Young took an ordinary source of light(S) such as light bulb.
- The light was made to pass through a very small slit S (which was comparable with the wavelength of light).
- The light coming from Source S was made to pass through two small slits S1 and S2 which were separated by a very small distance d.
- One screen was kept in front of these 2 sources.
Observation1:-
- He observed alternate dark and light bands were formed on the screen.
Setup 2:-
- Now he took 2 light bulbs i.e. 2 non coherent sources of light and placed a screen in front of them.
Observation 2:-
- He observed there were no alternate bands of light formed on the screen.
- Conclusion:-
- When coherent sources of light were taken then the phenomenon of interference is taking place.
- When non-coherent sources were taken phenomenon of interference was not taking place.
Posted by Rahul Ravinay 5 years, 7 months ago
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Yogita Ingle 5 years, 7 months ago
Formation of energy bands in solids
- The solid crystals are formed when the isolated atoms are brought together. Various interactions occur between the neighboring atoms.
- At a particular interatomic spacing d, there is a proper balance between forces of attraction to form a crystal. In this process, the changes occur in the electron energy level configurations.
- In case of a single atom, there is a single energy for an electron orbit.
- However, when two atoms are brought close to each other, it leads to intermixing of electrons in the valence shell.
- As a result, the number of permissible energy levels is formed, which is called an energy band.
- Three bands are important from the conductivity point of view, which are,
- Valence band
- Conduction band
- Forbidden gap or band
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Yogita Ingle 5 years, 7 months ago
Ultraviolet light is a type of electromagnetic radiation that makes black-light posters glow, and is responsible for summer tans — and sunburns. However, too much exposure to UV radiation is damaging to living tissue.
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Nishant Kapoor213 5 years, 6 months ago
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