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What is Unit cell?
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Smallest repeating structure in a crystal that has all properties similar to crystal structure
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What is Atomic basis?
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Every point in space lattice is associated with one or more atoms is called atomic basis
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What is Space lattice?
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Infinite 3d array of points in which every point has surroundings identical with that of every other point.
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What is Susceptibility?
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Magnetic susceptibility is the measure of extent to which a material may be magnetized by applied magnetic field.
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What are Diamagnetic materials?
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Materials which weakly repell magnetic field and do not retain magnetic properties when external field is removed.
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What are Paramagnetic materials?
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Materials which are slightly attracted by a magnetic field but do not retain the magnetic properties when external field is removed.
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What are Ferromagnetic materials?
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Materials which are strongly attracted by magnetic field and retain their magnetic properties when external field is removed.
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What are ferrimagnetic materials?
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Materials in which unequal opposite magnetic moments are present.
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What is Flux?
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Flux is the number of magnetic field lines passing through a surface.
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What is Flux density?
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The number of magnetic field lines passing through unit area.
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What is domain?
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A group of atomic magnets pointing in the same direction is called domain.
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What is p type?
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Semiconductors doped with trivalent atoms
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what is n type?
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Semiconductors doped with pentravalent atoms
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What is on pn junction diode?
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Interface between p type and n type semiconductor
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What is forward biased?
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In forward biased the p side of the diode is attached to positive terminal and n side to negative terminal of the battery.
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What is reversed biased?
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In reverse biased the p side of diode is attached to negative terminal and n side is attached to positive terminal
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What is Band gap?
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Distance between valence band of electrons and conduction band.
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What is Fermi level?
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It is the highest energy level that an electron can occupy at absolute zero temperature.
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What is valence band?
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Highest level of completely filled band by electrons
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What is conduction band?
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Lowest level of empty band.Conductivity of semiconductor increases with increase in temperature.Probability of finding electron in conduction band and valence band is zero
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What is formula for time period in Torsional Pendulum?
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T = 2π√l/3g
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What is formula for time period Compound Pendulum?
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T= 2π√l/g
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What is radius of gyration?
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Radial distance to a point which would have moment of inertia same as the distribution of mass if the whole mass was concentrated at that point.
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What is band gap?
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The energy difference between highest level of valence band and lowest level of conduction band.
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What is Fermi energy level?
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It is highest energy level that an electron can occupy at absolute zero temperature.
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What is Fermi energy?
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Maximum energy that an electron can possess at absolute zero temperature.
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What is potential barrier?
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Postential difference developed accross the pn junction due to diffusion of electrons from n region to p region.
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What is depletion region?
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Gap created across the pn junction which is devoid of charge carriers. It contains immobile charge carriers.
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What is doping?
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Doping is introduction of impurities to intrinsic semiconductors to vary the number of number of electrons and holes.
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Why circular pattern is observed?
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Because of the same thickness of air from all sides
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What if we increase the wavelength
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The diameter of the ring will increase
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What is Newton's Rings?
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It a phenomenon in which interference pattern is created by reflection of light between two surfaces , the spherical surface and the flat surface.
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What is specific heat capacity?
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The amount of heat required to raise the temperature of 1 g of a substance by 1 degree celcius is called specific heat.
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What is latent heat?
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The energy that is absorbed or released during the phase change of a substance.
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What is 1 cal?
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1 cal is the amount of heat required to raise the temperature of 1 g of water by 1°C.
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What is convection?
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Convection is the process of heat transfer due to movement of molecules in fluid.
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What is radiation?
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Radiation is the process of heat transfer through electromagnetic waves.
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What is conduction?
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The process of Heat transfer due to vibration of atoms.
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