2010 Jawaharlal Nehru Technological University, Hyderabad I B.Tech Regular Examinations,June 2010 ENGINEERING PHYSICS Question paper
Code No: 09A1BS02 R09 Set No. 2
I B.Tech Regular Examinations,June 2010
ENGINEERING PHYSICS
Common to CE, ME, CHEM, BME, IT, MECT, MEP, AE, BT, AME, ICE,
E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE
Time: 3 hours Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
1. (a) What is statistical mechanics? Write notes on Bose-Einstein statistics.
(b) Write notes on black body radiation.
(c) Calculate the energies that can be possessed by a particle of mass
8.50 10??31kg which is placed in an in nite potential box of width 10??9cm.
[6+5+4]
2. (a) What is the meaning of nanotechnology? Explain.
(b) Describe the processes of \sol-gel" and \precipitation" in the fabrication of
nano- structures.
(c) Write the applications of nanotechnology in Electronic Industry. [4+7+4]
3. (a) Write notes on volume defects in crystals.
(b) What is Burger's vector? What is Burger's circuit? Explain.
(c) If the average energy required to create a Frenkel defect in an ionic crystal is
1.35 eV, calculate the ratio of Frenkel defects at 250C and 3500C. [5+6+4]
4. (a) Discuss the band theory of solids and explain the formation of bands and
concept of holes.
(b) What is e ective mass of an electron? Derive an expression for the e ective
mass of an electron. [9+6]
5. (a) Explain the formation and properties of an ionic crystal, with a suitable ex-
ample.
(b) Derive an expression for the cohesive energy of an ionic crystal. [7+8]
6. (a) What is Meissner e ect? Explain, in detail.
(b) Distinguish a super-conductor and a normal metal, both maintained at same
temperature.
(c) Write notes on magnetic levitation. [5+5+5]
7. (a) Explain the characteristics of a laser beam.
(b) Describe the construction of He-Ne laser and discuss with relevant ELD, the
working of He-Ne laser.
(c) What are the di erences between a laser diode and an LED? [4+7+4]
8. (a) Derive an expression for carrier concentration of p-type semiconductors.
(b) Explain Hall e ect and its importance.
(c) For a semiconductor, the Hall coe cient is -6.85 10??5 m3/coulomb, and
electrical conductivity is 250 m??1
??1. Calculate the density and mobility of
the charge carriers. [7+4+4]
KEYWORDS:ENGINEERING PHYSICS,ENGINEERING PHYSICS QUESTION PAPER,JNTU,JNTU QUESTION PAPER,JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA-IV SEMESTER SUPPLEMENTARY EXAMINATIONS JUNE ENGINEERING PHYSICS
Code No: 09A1BS02 R09 Set No. 2
I B.Tech Regular Examinations,June 2010
ENGINEERING PHYSICS
Common to CE, ME, CHEM, BME, IT, MECT, MEP, AE, BT, AME, ICE,
E.COMP.E, MMT, ETM, EIE, CSE, ECE, EEE
Time: 3 hours Max Marks: 75
Answer any FIVE Questions
All Questions carry equal marks
1. (a) What is statistical mechanics? Write notes on Bose-Einstein statistics.
(b) Write notes on black body radiation.
(c) Calculate the energies that can be possessed by a particle of mass
8.50 10??31kg which is placed in an in nite potential box of width 10??9cm.
[6+5+4]
2. (a) What is the meaning of nanotechnology? Explain.
(b) Describe the processes of \sol-gel" and \precipitation" in the fabrication of
nano- structures.
(c) Write the applications of nanotechnology in Electronic Industry. [4+7+4]
3. (a) Write notes on volume defects in crystals.
(b) What is Burger's vector? What is Burger's circuit? Explain.
(c) If the average energy required to create a Frenkel defect in an ionic crystal is
1.35 eV, calculate the ratio of Frenkel defects at 250C and 3500C. [5+6+4]
4. (a) Discuss the band theory of solids and explain the formation of bands and
concept of holes.
(b) What is e ective mass of an electron? Derive an expression for the e ective
mass of an electron. [9+6]
5. (a) Explain the formation and properties of an ionic crystal, with a suitable ex-
ample.
(b) Derive an expression for the cohesive energy of an ionic crystal. [7+8]
6. (a) What is Meissner e ect? Explain, in detail.
(b) Distinguish a super-conductor and a normal metal, both maintained at same
temperature.
(c) Write notes on magnetic levitation. [5+5+5]
7. (a) Explain the characteristics of a laser beam.
(b) Describe the construction of He-Ne laser and discuss with relevant ELD, the
working of He-Ne laser.
(c) What are the di erences between a laser diode and an LED? [4+7+4]
8. (a) Derive an expression for carrier concentration of p-type semiconductors.
(b) Explain Hall e ect and its importance.
(c) For a semiconductor, the Hall coe cient is -6.85 10??5 m3/coulomb, and
electrical conductivity is 250 m??1
??1. Calculate the density and mobility of
the charge carriers. [7+4+4]
KEYWORDS:ENGINEERING PHYSICS,ENGINEERING PHYSICS QUESTION PAPER,JNTU,JNTU QUESTION PAPER,JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA-IV SEMESTER SUPPLEMENTARY EXAMINATIONS JUNE ENGINEERING PHYSICS