KEYWORDS:2010 Jawaharlal Nehru Technological University, Hyderabad Code No: 09A1BS02 R09 Set No. 1 I B.Tech Regular Examinations,June 2010 ENGINEERING PHYSICS Question paper
Code No: 09A1BS02 R09 Set No. 1
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) Explain the principle behind the functioning of an optical bre.
(b) Derive an expression for numerical aperture of an optical bre.
(c) Write any three applications of optical bres. [4+7+4]
2. (a) Distinguish between intrinsic and extrinsic semicondutors.
(b) Derive an expression for the density of holes in the valence band of an intrinsic
semiconductor. [7+8]
3. (a) What is bonding in solids? Write the list of di erent types of bonding in
solids.
(b) Describe with suitable examples, the formation of ionic and covalent bonds in
solids.
(c) What is cohesive energy of a molecule? Explain. [4+7+4]
4. (a) What is Bloch theorem? Explain.
(b) Write the conclusions given by Kronig-Penney model.
(c) For an electron under motion in a periodic potential, plot the curve between
the e ective mass of the electron and wave number, and explain. [5+5+5]
5. (a) Describe any three processes by which nanomaterials are fabricated.
(b) Describe the important applications of nanotechnology. [9+6]
6. (a) De ne magnetic moment. What is Bohr magneton? Explain.
(b) What are the characteristics of diamagnetic, paramagnetic and ferromagnetic
substances? Explain their behavior with the help of examples.
(c) If a magnetic eld of strength 300 amp/metre produces a magnetization of
4200 A/m in a ferromagnetic material, nd the relative permeability of the
material. [3+9+3]
7. (a) Explain the concept of dual nature of the light.
(b) Describe the experimental veri cation of matter waves using Davisson-Germer
(c) Calculate the wavelength of matter wave associated with a neutron whose
kinetic energy is 1.5 times the rest mass of electron.
(Given that Mass of neutron = 1.676 10??27 kg, Mass of electron = 9.1 10??31 kg, Planck's constant = 6.62 10??34 J-sec, Velocity of light = 3 108
m/s). [4+7+4]
8. (a) Write notes on Bragg's law.
(b) Describe Bragg's X-ray spectrometer method in the determination crystal
structure.
(c) Calculate the glancing angle of (1 1 1) plane of a cubic crystal having axial
length 0.19 nm corresponding to the second order di raction maximum for
the X-rays of wavelength 0.058 nm. [4+7+4]
KEYWORDS:JNTU ENGINEERING PHYSICS,JNTU ENGINEERING PHYSICS QUESTION PAPER,JNTU,JNTU QUESTION PAPER,JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA-IV SEMESTER SUPPLEMENTARY EXAMINATIONS JUNE 2010 JNTU ENGINEERING PHYSICS
Code No: 09A1BS02 R09 Set No. 1
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) Explain the principle behind the functioning of an optical bre.
(b) Derive an expression for numerical aperture of an optical bre.
(c) Write any three applications of optical bres. [4+7+4]
2. (a) Distinguish between intrinsic and extrinsic semicondutors.
(b) Derive an expression for the density of holes in the valence band of an intrinsic
semiconductor. [7+8]
3. (a) What is bonding in solids? Write the list of di erent types of bonding in
solids.
(b) Describe with suitable examples, the formation of ionic and covalent bonds in
solids.
(c) What is cohesive energy of a molecule? Explain. [4+7+4]
4. (a) What is Bloch theorem? Explain.
(b) Write the conclusions given by Kronig-Penney model.
(c) For an electron under motion in a periodic potential, plot the curve between
the e ective mass of the electron and wave number, and explain. [5+5+5]
5. (a) Describe any three processes by which nanomaterials are fabricated.
(b) Describe the important applications of nanotechnology. [9+6]
6. (a) De ne magnetic moment. What is Bohr magneton? Explain.
(b) What are the characteristics of diamagnetic, paramagnetic and ferromagnetic
substances? Explain their behavior with the help of examples.
(c) If a magnetic eld of strength 300 amp/metre produces a magnetization of
4200 A/m in a ferromagnetic material, nd the relative permeability of the
material. [3+9+3]
7. (a) Explain the concept of dual nature of the light.
(b) Describe the experimental veri cation of matter waves using Davisson-Germer
(c) Calculate the wavelength of matter wave associated with a neutron whose
kinetic energy is 1.5 times the rest mass of electron.
(Given that Mass of neutron = 1.676 10??27 kg, Mass of electron = 9.1 10??31 kg, Planck's constant = 6.62 10??34 J-sec, Velocity of light = 3 108
m/s). [4+7+4]
8. (a) Write notes on Bragg's law.
(b) Describe Bragg's X-ray spectrometer method in the determination crystal
structure.
(c) Calculate the glancing angle of (1 1 1) plane of a cubic crystal having axial
length 0.19 nm corresponding to the second order di raction maximum for
the X-rays of wavelength 0.058 nm. [4+7+4]
KEYWORDS:JNTU ENGINEERING PHYSICS,JNTU ENGINEERING PHYSICS QUESTION PAPER,JNTU,JNTU QUESTION PAPER,JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD MCA-IV SEMESTER SUPPLEMENTARY EXAMINATIONS JUNE 2010 JNTU ENGINEERING PHYSICS