102 physics 2005

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102 PHYSICS

BTECH FIRST YEAR EXAMINATION JUNE 2008

ENGINEERING PHYSICS Max marks:100

Time:3 Hrs

PART A

1. a) How will you test the optical planeness of a glass plate?

b) Calculate the thickness of a retardation plate, that can convert a PPL into CPL.

Given wavelength =589nm, refractive indices for extraordinary rays = 1.55,

refractive indices for ordinary rays = 1.54.

c) Briefly explain the principle of holography.

d) List any 5 applications of ultrasonic waves.

e) Using Heisenberg’s uncertainty principle, prove that no electron is residing inside

the nucleus.

f) What are thermonuclear reactions?

g) Explain the terms : Lattice Planes & Miller Indices

h) What is meant by double refraction?

PART B

2. a) Discuss the theory of interference in thin films.

b) Give differences b/w Interference & Diffraction.

OR

3. a) Explain the construction & working of a Nicol Prism.

b) What are half shades? Briefly explain the working of Lorantz half shade.

4. a) Explain the terms 1) Optical Pumping 2) Stimulated emission

b) Outline the principle & working of the He-Ne Laser.

OR

5. a) Derive the expression for Numerical Aperture of an optical fibre.

b) Explain the working of an optical fibre communication system.

6. a) What is a wave function? Give its physical significance.

b) Derive time independent Schrodinger equation.

OR

7. a) Explain the working of a Nuclear reactor.

b) State Pauli’s exclusion principle.

8. a) State & explain Bragg’s law.

b) Give the classification of semiconductors with their applications.

OR

9. a) What is Meissner effect?

b) Distinguish b/w type I & type II superconductors with eg.

------------------------------

BTECH FIRST YEAR EXAMINATION JUNE 2008

ENGINEERING PHYSICS Max marks:100

Time:3 Hrs

PART A

1. a) How will you test the optical planeness of a glass plate?

b) Calculate the thickness of a retardation plate, that can convert a PPL into CPL.

Given wavelength =589nm, refractive indices for extraordinary rays = 1.55,

refractive indices for ordinary rays = 1.54.

c) Briefly explain the principle of holography.

d) List any 5 applications of ultrasonic waves.

e) Using Heisenberg’s uncertainty principle, prove that no electron is residing inside

the nucleus.

f) What are thermonuclear reactions?

g) Explain the terms : Lattice Planes & Miller Indices

h) What is meant by double refraction?

PART B

2. a) Discuss the theory of interference in thin films.

b) Give differences b/w Interference & Diffraction.

OR

3. a) Explain the construction & working of a Nicol Prism.

b) What are half shades? Briefly explain the working of Lorantz half shade.

4. a) Explain the terms 1) Optical Pumping 2) Stimulated emission

b) Outline the principle & working of the He-Ne Laser.

OR

5. a) Derive the expression for Numerical Aperture of an optical fibre.

b) Explain the working of an optical fibre communication system.

6. a) What is a wave function? Give its physical significance.

b) Derive time independent Schrodinger equation.

OR

7. a) Explain the working of a Nuclear reactor.

b) State Pauli’s exclusion principle.

8. a) State & explain Bragg’s law.

b) Give the classification of semiconductors with their applications.

OR

9. a) What is Meissner effect?

b) Distinguish b/w type I & type II superconductors with eg.

------------------------------

102 PHYSICS

Engineering Physics (June 2006)

1a. Explain with necessary theory the interference of light from a plane parallel sided thin transparent film, illuminated by a monochromatic light

b. Explain why an extended source of white light is required to see colours in thin films

c. Determine the minimum wavelength reflected by a thin film of thickness 4.66x10^-5 cm and of refractive index 1.5 when it is illuminated by a white light.

2a. Distinguish between continuous X-ray spectrum and characteristic X-ray spectrum

b. What is Moseley's Law? Explain its importance

c. An X-ray machine has an accelerating potential difference of 50 kV. Calculate the shortest wavelength and the corresponding maximum frequency

3a. Compare Fresnel and Fraunhoffer types of diffraction

b. Explain Fresnel's half period zone and show that the areas of Fresnel's half period zones are equal

c. Light of wavelength 5461 A is incident normally on a grating having a grating element 1.5x10^-4 cm. Find the angle at which the first diffracted beam is observed

4a. Describe the construction, working and uses of a Nicol prism

b. Explain positive and negative crystals

c. What are the uses of polarized light?

5a. Explain spontaneous emission and stimulated emission

b. How population inversion is achieved?

c. Explain the working of Helium-Neon laser

6a. Explain the principle of Holography

b. Discuss the application of lasers in engineering

c. How magnetic tape recording is done

7a. Explain the folowing terms: numerical aperture, acceptance angle, acceptance cone

b. Explain the advantages of optical fibres over ordinary cable

c. Calculate the numerical aperture and acceptance angle of an optical fibre from the following data: refractive index of core= 1.55 and refractive index of cladding= 1.55

8a. Discuss the single and multimode optical fibres

b. Explain the working of optical fibre sensors

c. Write a short note on integrated optics

9a. Explain the different types of electrio polarisation in dielecrics

b. Draw the planes with the following : Miller Indices (111) (110) and (010)

c. Calculate the interplanar spacing for a (321) plane in a simple cubic lattice with a lattice constant a= 2.54A

10a.Explain superconductivity

b. Compare type I and type II superconductors

c. Write a short note on SQUIDS

102 PHYSICS

MODEL EXAMINATION –APRIL 2007

ENGINEERING PHYSICS

Time:3Hrs Max marks:100

PART A

1. What is the difference b/w interference & diffraction of light?

2. For a plane diffraction grating with 5000 lines per cm used at normal incidence.

1.What is the largest wavelength of light for which a spectrum can be observed?

2. For wave length of 6000 angstrom what is the highest order of the spectrum that

can be observed?

3. What is packing factor& unit cell?

4. Explain the principle of holography.

5. State& explain Heisenberg’s uncertainty principle.

6. Explain Vector atom model & its concepts.

7. What is dispersive power of a grating? Obtain an expression for dispersive power.

8. Calculate the thickness of a quarter wave plate for light of wavelength 5896 angstrom.

The refractive indices for ordinary & extra ordinary rays being 1.54& 1.55

respectively.

PART B

9. Describe the theory , construction & working of Michelson’s interferometer .How can

it used to measure length?

OR

10. What is optical activity ? Explain Laurent’s half shade polarimeter.

11. Outline the principle & working of He- Ne laser? What is stimulated emission? How

does it differ from spontaneous emission?

OR

12. What is the principle of optic fibre?

13. Derive the Schrondinger time independent equation.

OR