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Posted By: arvind Member Level: Bronze Posted Date: 20 May 2008
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2008 Maharshi Dayanand University B.Tech Mechanical Engineering physics-||,second semester,btech. Question paper
1212
B.TECH.2nd Sem.
Examination-May,2008
Physics-||
Paper:phy-102-E
Time:three hours
Max.Marks:100
Note:Attempt any five questions,selecting at least two questions fronm each part.
PART-A
Q1(a)What are miller indices?Give their significance.How would you determine the miller indices of a plane in a crystal ?
(b)What are point defects in solids?DErive an expression for the concentration of scottky defects at equilibrum temperature.
Q2(a)What is planck"s constant?Discuss its significance.
(b)Derive time independent schrodinger wave equation for a free particle.
Q3(a)Discuss th motion of a free electron in a periodic potential and discussFermi-Dirac distribution function.
.
(b)What is density of states?Dicuss briefly.
Q4)Write notes on any two:
(a)Xray diffraction powder method for crystal structure analysis.
(b)Thermionic Emmission,
(c)Drude theory of conduction.
PART-B
Q5)Discuss briefly
(a)Origin of energy bands.
(b)E-k diagrams,and
(c)Brillouin zones.
Q6(a)What is photo-conductivity?Discuss a simple model of photo conductor.Show that sensitive photo-conductors should have long response time.
(b)Write a short note on photovoltaic cells.
Q7(a)What is superconductivity?Give salients features of superconductivity and uses of superconductors.
(b)Describe london theory of superconductivity.
Q8)Write notes on any two:
(a)Classical theory of ferromagnetism,
(b)Effective mass,
(c)Hall Effect.
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