Old Exam Papers Dec. 2010 - Video

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7. Explain Hall effect for semiconductors. Explain the physical
origin of negative mass and on the basis of it, discuss the
concept of mass. 5+2+3
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8. (a) Discuss electronic and orientational polarisation
? ?
for materials. Derive a relation between P, E and
?
D. 3+3+2
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? ? ?
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(b) The energy of band is given by E = 3 + 5 K + 9 K 2 .
Find the effective mass of an electron. 2
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dhft;sA 2
9. (a) Explain Diamagnetic, Paramagnetic and Ferro
magnetic materials with examples. State Curie law
and define Curie temperature. 6
600 4 PH-10
Papers (A) (December) 2010
(601)
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dhft;sA 7
(b) Find reciprocal lattice for vectors 2i, 3j and 4k
vectors. 3
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Kkr dhft;sA 3
5. Prove that monoatomic linear chain behaves like a low pass
filter. 10
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6. (a) Using Einstein's model derive a formula for specific
heat of solids. How the specific heat varies with
temperature in low temperature range according to
this model ? 5+2
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(b) Using Drude Lorentz model, prove that electrical
conductivity is a linear function of relaxation
time. 3
PH-10 3 PTO