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GALLIUM PHOSPIDE: It has band gap of 2.3ev. it can be used for light emitting diodes which can emit green or red light. The red light is obtained with zinc or cadmium oxide doping.
SELENIUM: It is found in crystalline and non-crystalline form. It is used as rectifier material for photo voltaic cells and for xerographic printing. Selenium films are used as photo electric light meters. Its melting point is 2200C.
LEAD: it is soft heavy and bluish gray metal. It is highly resistant to many chemical actions but can corrode by nitric acid, lime and rotten organic substances. Lead and its compounds are toxic. It is mechanically weak it cannot withstand vibrations at high temperatures. It alloys easily with Tin and zinc and forms many commercial alloys, including solders and bearing metals.
Photoelectric effect An effect described by A. Einstein that demonstrates that light appears to be built up of photons or particles. Light can do excite electrons (called phot
Q. Double convex lenses are to be manufactured from a glass of refractive index1.55, With both faces of the same radius of curvature. What is the radius of curvature? Required if
what is virtual ground
Light from a monochromatic source of wavelength 4000A 0 is incident on a grating having 5000 rulings / cm. The spectrum is focused on a screen by a lens of focal length
Regard as two Styrofoam cups. Each one is on the end of its own neutral slender glass rod which serves as a handle. One of the cups has a fixed amount of positive charge consistent
Vector Addition While we become students of physics and approach the job of adding vector quantities, we soon become aware of the fact in which the addition of two vector quant
1 OHM: If a potential difference of 1 volt is applied across the ends of a conductor and the resulting current flowing by the conductor is 1 ampere, the resistance of the condu
INELASTIC COLLISION: "The collision in which total momentum is preserved but total K.E of system is not conserved is known as inelastic collision". It is to be noted that m
An equilateral triangle is inscribed in a circle of radius 2 cm if P lies inside the triangle then the minimum sum of distances of P from the sides of the triangle is? Ans
It is the ratio of the internal electric field induced by the charges on the surface on the dielectric when an external field applied to the polarization of the dielectric.
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