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Reg. No. :
B.E./B.Tech. DEGREE EXAMINATION, JUNE 2010
Second Semester
PH 2161 ENGINEERING PHYSICS II
(Common to all branches)
(Regulation 2008)
Time : Three hours Maximum : 100 Marks
Answer ALL Questions
PART A (10 2 = 20 Marks)
1. Mention the demerits of classical free electron theory.2.
Calculate the Fermi energy of copper at 0K if the concentration of
electron is
8.5 1028m3.
3. Distinguish between n-type and p-type semiconductors.4.
Mention the uses of Hall Effect.5. The transition temperature for a
superconducting material is 3.7 K at zero
magnetic field and critical field is 0.0306 A/m at 0K. Calculate
the critical
field at 2K.
6. Define antiferromagnetism. Mention two materials that
exhibitantiferromagnetism.
7. What is ionic polarisation? Write an expression for ionic
polarisability.8. State the properties of ferroelectric
materials.9. Explain shape memory effect.10. Name the types of
metallic glasses and mention few metallic glasses.
Question Paper Code:E3165
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PART B (5 16 = 80 Marks)
(Plancks constant = 6.63 1034 Js, Boltzman constant = 1.38
1023JK1,
Mass of the electron = 9.1 1031kg, Charge of electron = 1.6
1019coulomb)
11. (a) (i) Define drift velocity and relaxation time. (2)(ii)
Derive expressions for both electrical conductivity and thermal
conductivity of electrons in metal. (7 + 7)
Or
(b) (i) Define density of states. (2)
(ii) Derive an expression for the density of states in a metal.
(10)
(iii) A conducting rod contains 8.5 1028 electrons per cubic
metre.
Calculate the electrical conductivity and mobility of electron,
if the
collision time for scattering is 2 1014sec. (4)
12. (a) (i) Derive an expression for the concentration of
electrons in theconduction band of an intrinsic semiconductor.
(10)
(ii) With necessary theory, describe the method of determining
the
band gap of an intrinsic semiconductor. (6)
Or
(b) (i) What is Hall effect? (2)
(ii) Give the theory of Hall effect. (8)
(iii) The density of silver is 10.5 103kg/m3 . The atomic weight
of silver
is 107.9. Assume that each silver atom provides one
conduction
electron. The electrical conductivity of silver at 20C is
6.8107 11 m . Determine the carrier concentration and
mobility
of electrons, if N = 6.02 1026atom/k. mol. (6)
13. (a) (i) Give the Weiss theory of ferromagnetism and derive
an expressionfor its susceptibility. (8)
(ii) Describe the structure, properties and applications of
ferrites. (8)
Or
(b) (i) Distinguish between soft and hard magnetic materials.
(5)
(ii) Explain Meissner effect. (3)
(iii) Describe Type I and Type II superconductors. (8)
14. (a) (i) Define local field in a dielectric. (2)
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E 31653
(ii) Derive an expression for the local field in a dielectric
for a cubicstructure. (10)
(iii) Deduce Clausius-Mosotti relation. (4)
Or
(b) (i) Discuss in detail the different dielectric breakdown
mechanisms.
(10)
(ii) Describe the frequency dependence of polarisation of a
dielectric
material. (6)
15. (a) (i) What are metallic glasses? How are they prepared? (2
+ 4)(ii) Describe their properties and application. (5 + 5)
Or
(b) (i) What are nano-phase materials? (2)
(ii) Describe the method of producing nano materials using
(1) chemical vapour deposition method (3)
(2) plasma assisted deposition method. (3)
(iii) Write a short note on carbon nano tubes. (8)
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