My Profile
Active Members
TodayLast 7 Days
more...
Awards & Gifts
Online Exams
Fresher Jobs
Our fresher job section is exclusively for fresh graduates! Find jobs for freshers in major Indian
cities including Bangalore, Chennai, Hyderabad, Pune or Kochi
Resources
Find educational articles, blogs, discussion threads and other resources.
Colleges
Find details about any college in India or search for courses.
|
Download Model question papers & previous years question papers
|
Posted By: Sriram Member Level: Diamond Posted Date: 04 Sep 2008
|
2008 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech SOLID STATE PHYSICS Set No. 2 Question paper
|
|
|
Code No: RR10201 Set No. 2
I B.Tech Supplimentary Examinations, February 2008
SOLID STATE PHYSICS
( Common to Electrical & Electronic Engineering, Electronics &
Communication Engineering, Computer Science & Engineering, Electronics
& Instrumentation Engineering, Bio-Medical Engineering, Information
Technology, Electronics & Control Engineering, Computer Science &
Systems Engineering, Electronics & Telematics, Electronics & Computer
Engineering and Instrumentation & Control Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Show that FCC is the most closely packed of the three cubic structures by
working out the packing factors.
(b) Describe the structure of NaCl. [10+6]
2. (a) What are Miller indices? How are they obtained?
(b) Explain Schottky and Frankel defects with the help of suitable figures. [6+10]
3. (a) Explain the physical significance of wave function.
(b) Assuming the time independent Schrodinger’s wave equation, discuss the so-
lution for a particle in a one-dimensional potential well of infinite height.
(c) A quantum particle confined to one-dimensional box of width ‘a’ is known to
be in its first excited state. Determine the probability of the particle in the
central half. [4+6+6]
4. (a) What are the salient features of the “free electron gas” model? Obtain Ohm’s
law based on it.
(b) Explain the concept of “effective mass”. [10+6]
5. (a) What is meant by local field in a dielectric? Explain. How is it calculated for
a cubic structure?
(b) Obtain Clausius Mosotti equation which relates the macroscopic dielectric
constant with microscopic polarizability. [8+8]
6. (a) What are paramagnetic materials? Explain.
(b) Obtain an expression for paramagnetic susceptibility (?). How does the para-
magnetic susceptibility of a material vary with temperature?
(c) A paramagnetic material has 1028 atoms per m3. Its susceptibility at 350 K
is 2.8 × 10-4. Calculate the susceptibility at 300 K. [4+8+4]
7. (a) Obtain an equation for the conductivity of an intrinsic semiconductor in terms
of carrier concentration and carrrier mobilities. Suggest a method for evaluat-
ing the energy gap of a semiconductor. Explain the temperature dependence
of intrinsic conductivity.
1 of 2
Code No: RR10201 Set No. 2
(b) The variation of the resistivity of intrinsic germanium with temperature is
given in the following table: [10+6]
T(K) 385 455 556 714
?(Ohm-m) 0.028 0.0061 0.0013 0.000274
Determine the value of Eg.
8. (a) Explain the terms
i. absorption
ii. spontaneous emission
iii. stimulated emission
iv. population inversion, relating to laser.
(b) Describe the principle of lasing action.
(c) Mention the important characteristics of laser beam. [6+5+5]
2 of 2
Return to question paper search
|
|
|
Submit Previous Years University Question Papers and make money from adsense revenue sharing program
Are you preparing for a university examination? Download model question papers
and practise before you write the exam.
|
Watch TV Channels
|