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Production of electricity by light:
The Photovoltaic Cell or Solar Cell. A photovoltaic cell generates an emf when light falls onto it. Several forms of photovoltaic cell exist, one of the earliest types being the selenium photovoltaic cell in which a layer of selenium is deposited on iron and any light falling on the selenium produces an emf between the selenium and the iron.
Modern theory shows that the junction at the interface between the two forms, what is known as a semi-conductor p-n junction in which one of the materials is p-type and the other is n-type. The most efficient photovoltaic cells incorporate semi-conductor p-n junctions in which one of the regions is a very thin layer (about 1μm thick) through which light can pass without significant loss of energy. When the light reaches the junction of the two regions it causes electrons and holes to be released, to give the electrovoltaic potential between the two regions.A better understanding of this action will be obtained later in the course when semi-conductor materials and devices are studied.
Eg of like and unlike parallel forces
Derive the relation between the magnitude of electric displacement and displacement current.
Which of the following are isoelectronic with one another: (1)Na + ans Ne (2)K + ans O (3)Ne ans O (4)Na + ans K + Ans: Na + ans Ne
How is plastic fibre material used in optical fibres? Plastic fibre: Plastic fibre is classically made of plastic. Such are low cost optical fibres. They have a huge NA and
Q. Write any three medical applications of laser. Medical applications (i) In medicine micro surgery has befall possible due to narrow angular spread of the laser beam.
Q. An X-ray diffraction of a crystal gave a closest line at an angle of 6o27'. If the wavelength of X-ray is 0.58Ao, find the distance between the two cleavage planes. 2d Sinθ
Fermi paradox (E. Fermi): E. Fermi's conjecture, simplified along phrase, "Where are they?" questioning that if the Galaxy is filled along with technological and intelligent c
uses of preset inductor
Can the whole charge of a body is transfer to another body
The area element that seems in the integral is a vector. Area like an amount of coverage would appear to be a scalar quantity. What is the way of the area element ? Ans
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