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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.
Used normally, a 150-watt, 120 volt light bulb requires how many amps of current? Ans: Used generally, a 150-watt, 120 volt light bulb needs 1.25 amps.
Coulomb: Coulomb is the fundamental unit of charge. It is explained as the charge required to obtain 9?109 newton of force among two equal charges separated at a distance of one m
A monkey of mass m climbs a rope slung over a light frictionless pulley.The opposite end of the rope is tied to a block of Mass M lying on a smooth horizontal plane.Find the accele
What do you mean by lateral shift produced by a parallel sided glass slab for grazing incidence of light? Describe dispersive power of a medium for a pair of colours.
why at critical temperature in superconductors resistance becomes zero? Solution) For conductors as the temperature increases their rasistance increases and as temperature decreas
Pitch: It is the characteristics of a sound by which we can distinguish among a grave and shrill sound is known as pitch. It depends on frequency of the vibrating body and expr
bcs theory of superconductivity.
S uppose you have two parallel, metal plates that have an electric field between them of strength 3.0 x 10 4 N/C, and are 0.050 m apart. Consider a point, P, located 0.030 m fr
A simple model of the earth and moon The earth can be shown by an orange or other round object stuck on a piece of bamboo or a meat skewer. A piece of bent wire or knitting nee
Clock spring balance A sensitive balance for use among 0-1 g or 1-10 g is readily made using a piece of clock spring and a block of wood or cotton reel. Fasten the wooden b
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