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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.
Compound Microscope: It is an optical instrument by which very small object like as biological specimens are seen that cannot be seen by naked eyes. Compound microscope havi
Consider air (ideal gas) as working substance inside a piston-cylinder device (closed system). This air undergoes a power cycle as shown in figure. Determine work output per unit m
Three capacitors with different capacitances are connected in series. Which of the following statements is TRUE? a) All three of the capacitors have the same potential diffe
Self inductance: When current through a coil changes, the changing flux induces an emf that opposes the current flow. This emf is the result of self inductance and is called '
A commuter train blows its horn as it passes a passenger platform at a constant speed of 40.0m/s. The train horn sounds at a frequency of 305 Hz when the train is at rest. (a) W
What is the principle of generating ultrasonic waves? The general principle comprised in generating ultrasonic waves is to reasons some dense material to vibrate very quickly.
Can you please, explain what is ''n'' in this equation: Q=ne?
The following three impedances are connected in series across a 40V, 20kHz supply: (i) a resistance of 8, (ii) a coil of inductance 130µHand5 resistance, and (iii) a 10 r
It is explained by Heisenberg's uncertainty principle, it is impossible to calculate simultaneously both the position and the momentum of the particle. Let x and p be the uncert
THOMSON'S ATOMIC MODEL:- According to Thomson's atomic model positive charge is distributed uniformly over the entire body of the atom while the electrons are embedded in it. S
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