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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.
what is electric field
An open barge has the dimensions 22x40x12m. If the bargeis made out of 4.0-cm-thick steel plate on each of its four sides and its bottom, what mass of coal can the barge carry in f
Laws of limiting friction
Q. A screen is placed 90 cm from an object. The image of the object on the screen is formed by a convex lens at two different locations separated by 20cm. Determine the focal lengt
Germanium possesses (A) One valence electrons. (B) Two valence electrons. (C) Three valence electrons. (D) Four valence electrons. Ans: Germanium possess
Major steps for analyzing forces in uniform circular motion: Let consider one axis along the radius of circle (i.e. in direction of acceleration) and other axis perpendicular to th
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An isotope of iodine (Z = 53) is used to treat thyroid conditions. Its mass number is 131. How many neutrons are in its nucleus? 131 - 53 = 78 neutrons
Inertia in an automobile You can view the same effect as in experiment 8 when you are riding in a car that is rapidly stopped. You have to brace yourself to keep from sliding
Que: When light is vertically polarized what is it regarding the light that is vertical? Ans: It is the electric field somewhat than the magnetic field that gets most o
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