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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 newtons motion law
Calculate the luminosity for a beam of protons of 1uA colliding with a stationary liquid hydrogen target 30cm long. Compare this to a typical colliding beam luminosity of 10e34 cm-
(a) Potential energy : An electron operates some potential energy due to this found in the field of nucleus potential energy of electron in nth orbit of radius rn is given by
In an ideal transformer , the no. of turns in primary & secondary are 200 & 1000 respectively .If power input to primary is 10kW at 200V.Calculate i)output voltage ii)current in
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A rectangular surface (0.14 m x 0.39 m) is oriented in a uniform electric field of 440 N/C. What is the maximum possible electric flux through the surface?
project
a particle of xkg pended by two light inextensible strings of AB and BC of lengths 8cm and 6cm respectively with the mass x attached to B. The end A and C are fixed at the same and
Show that the spectrum of thermal radiation for T ¼ 300K peaks at approximately 10 microns Minimum 100 words accepted
The magnetic field of Earth resembles the field of a bar magnet. The north pole of a compass needle, used for navigation, generally points toward the geographic north pole.
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