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