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Jawaharlal Nehru Technological University Anantapur 2009 B.Tech Regular s,e ENGINEERING PHYSIC set - 2 - Question Paper

Wednesday, 29 May 2013 05:15Web



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

What is statistical mechanics? Write notes on Bose-Einstein statistics.

1.

Write notes on black body radiation.

Calculate the energies that can be possessed by a particle of mass

c

8.50 x 10-31kg which is placed in an infinite potential box of width 10-9cm.

Code No: 09A1BS02    R09    Set No. 2

[6+5+4]

What is the meaning of nanotechnology? Explain.

2.

Describe the processes of sol-gel and precipitation in the fabrication of nano- structures.

Code No: 09A1BS02    R09    Set No. 2

Write the applications of nanotechnology in Electronic Industry. [4+7+4]

c

Write notes on volume defects in crystals.

3.

What is Burgers vector? What is Burgers circuit? Explain.

Code No: 09A1BS02    R09    Set No. 2

If the average energy required to create a Frenkel defect in an ionic crystal is

c

1.35 eV, calculate the ratio of Frenkel defects at 250C and 3500C. [5+6+4]

Discuss the band theory of solids and explain the formation of bands and concept of holes.

4.

a

b

What is effective mass of an electron? Derive an expression for the effective mass of an electron.    [9+6]

Explain the formation and properties of an ionic crystal, with a suitable example.

5.

a

b

Derive an expression for the cohesive energy of an ionic crystal.    [7+8]

a)    What is Meissner effect? Explain, in detail.

6.

b)    Distinguish a super-conductor and a normal metal, both maintained at same temperature.

Write notes on magnetic levitation.    [5+5+5]

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 differences 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 effect and its importance.

(c)    For a semiconductor, the Hall coefficient is -6.85 x 10-5 m3/coulomb, and electrical conductivity is 250 m-1 Q-1. Calculate the density and mobility of the charge carriers.    [7+4+4]

2







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