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Explain the types of polymorphism
In terms of thermodynamics, there are two kinds of polymorphism. For a monotropic system, a plot of the free energy of the various polymorphs against temperature do not cross before all polymorphs melt--in other words, any transition from one polymorph to another will be irreversible. For an enantiotropy system, a plot of the free energy against temperature shows a crossing point before the various melting points, and it might be possible to convert reversibly among the two polymorphs on heating and cooling.
Cosmological redshift An effect where light emitted through a distant source seems redshifted due to the expansion of spacetime itself.
define electrostatistic
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At 200.0 K, silicon has 3.79 x 10 -18 free electrons per atom. How many free electrons/cm 3 are there in silicon at this temperature?
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The helicopter view in fig. p3.29
State Huygens' Principle. With the help of a suitable diagram, prove Snell's law of refraction using Huygens' Principle.
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