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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.
Explain the Elementary Particles and Particle Accelerators More than 100 particles smaller than the proton, electron and neutron have been discovered and are referred to as eleme
How is radiation emitted from the body? The body radiates energy by thermal conduction by the skin to the air, clothes, etc, around the body. A small amount of energy would als
1. Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it. II. The relationship between an object''s mass m,
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Light described at a place by the equation E=100[sin(5*10^15)t + sin(8*10^15)t] falls on the metal surface having work function 2eV.calculate the maximum kinetic energy of photoel
A 30-g car rolls from a hill 12 cm high and is traveling at 154 cm/s as it travels along a 275 cm horizontal track. What is the momentum of the car?
a sinusodal transverse wave is travelling on a string any point on the string
In the circuit shown in Figure, the slider S is at the half-way point. (a) Calculate the p.d. across and the current flowing in the 400 Ω load resistor. (b) Is the circuit a
Distinguish among, analog and digital communication. Write any two modulation methods employed for the digital data. Explain briefly one of the techniques used.
why phase is defined only for periodic motion ?
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