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December 2007

Sree Narayana Guru College of Engineering and Technology, Payyanur
First series test - December 2007


EN2K 102: ENGINEERING PHYSICS

Time: 11/2Hours Marks: 50

Part A: Answer all questions


1 Explain why the center of Newton’s rings is dark in the reflected system.
2 Explain Fresnel’s and Fraunhoffer diffraction.
3 Describe how half shade polarimeter is used to determine the specific rotation of glucose.
4 Write briefly how elliptically polarized light can be detected.
(4x5=20 Marks)


Part B: Answer two questions

5 (a) Explain the phenomenon of interference in thin films. Obtain expressions for constructive and destructive interference in the reflected system. (10 Marks)

(b) A diffraction grating used at normal incidence gives a green line (5400Å) of a certain order superimposed on a violet line (4050Å) of the next order. If the angle of diffraction is 30 degrees, find the number of lines per meter of the grating. (5 Marks)

OR

6 (a) Explain how the refractive index of a liquid can be determined by forming wedge shaped film. Derive the formula used. (10 Marks)
(b) Light of wavelength 6000Å falls on a grating normally. Two adjacent principal maxima occur at 120 and 15.060 respectively. Calculate the grating element. (5 Marks)

7 (a) Explain the crystal structure of calcite. Explain the method of construction of nicol prism from a calcite crystal. (10 Marks)
(b)A column of sugar solution 0.2m long rotates the plane polarization through 170. If the specific rotation of sugar solution is 0.0116 rad/m/kg/m3. Find the amount of sugar in unit volume of the solution. (5 Marks)

OR

8 (a) Write a brief note on half wave plate and quarter wave plate. Write any five applications of polarized light (10 Marks)
(b) A sugar solution in a tube of length 20 cm produces optical rotation of 130. The solution is then diluted to one third of its previous concentration. Find the optical rotation produced by 30 cm long tube containing the diluted solution. (5 Marks)

December 2006(For all)

Sree Narayana Guru College of Engineering and Technology, Payyanur
First series test - December 2006


ENGINEERING PHYSICS

Time: 2Hours Marks: 50

Part A: Answer all questions



1 Explain why the center of Newton’s rings is dark in the reflected system.
2 Give the theory of a plane diffraction grating.
3 Explain the method of production of circularly polarized light.
4 Write briefly how elliptically polarized light can be detected. (4x5=20 Marks)

Part B: Answer two questions

5 (a) Explain the phenomenon of interference in thin films. Obtain expressions for constructive and destructive interference in the reflected system. (10 Marks)

(b) A diffraction grating used at normal incidence gives a green line (5400Å) of a certain order superimposed on a violet line (4050Å) of the next order. If the angle of diffraction is 30 degrees, find the number of lines per meter of the grating. (5 Marks)

OR

6 (a) Explain how the refractive index of a liquid can be determined by forming wedge shaped film. Derive the formula used. (10 Marks)
(b) Light of wavelength 6000Å falls on a grating normally. Two adjacent principal maxima occur at 120 and 15.060 respectively. Calculate the grating element. (5 Marks)

7 (a) Explain the crystal structure of calcite. Explain the method of construction of nicol prism from a calcite crystal. (10 Marks)
(b) If the diameters of two consecutive Newton’s rings in reflected light of wavelength 5890Å are 2.00 and 2.02 cm respectively, what is the radius of curvature of the lens surface in contact with plane glass surface. (5 Marks)

OR

8 (a) Explain how the wavelength of a source can be determined by using Newton’s rings experiment. (10 Marks)
(b) A sugar solution in a tube of length 20 cm produces optical rotation of 130. The solution is then diluted to one third of its previous concentration. Find the optical rotation produced by 30 cm long tube containing the diluted solution. (5 Marks)



April 2007(ME)

Sree Narayana Guru College of Engineering and Technology, Payyanur
Second series test - April 2007


ENGINEERING PHYSICS(B)
(ME)

Time: 2Hours Marks: 50

Part A: Answer all questions


1. What are the differences between spontaneous and stimulated emission.
2. Explain the basic principle of Holography. Mention its applications.
3. Describe the working of He-Ne laser with energy level diagram.
4. What are ultrasonics? How they are detected?
(4x5=20 Marks)


Part B: Answer two questions


5 (a) What are isochromatics and isoclinics? Give the mathematical analysis of them. (10 Marks)

(b) Write a note on Meissner effect. (5 Marks)

OR

6 (a) Explain the magnetic behaviour of type І and type II superconductors. (10 Marks)
(b) Arrive at stress-optic relations for two-dimensional case. (5 Marks)


7 (a) State and derive Bragg’s law of X-ray diffraction. Describe X-ray spectrometer and explain how it is used to determine the interplanar spacing of a crystal. (10 Marks)
(b) Give an account of various breakdown mechanisms. (5 Marks)

OR

8 (a) Explain with energy band diagram the classification of solids into metals, semiconductors and insulators. (5 Marks)
(b) Write a note on radiographic method of nondestructive testing. (5 Marks)
(c) Explain the importance of reverberation time in good acoustics (5 Marks)






April 2007(EEE/ECE/CSE)

Sree Narayana Guru College of Engineering and Technology, Payyanur
Second series test - April 2007


ENGINEERING PHYSICS(A)
(EEE/ECE/CSE)

Time: 2Hours Marks: 50

Part A: Answer all questions


1. Describe the construction and working of a solar cell.
2. Explain the basic principle of electron spin resonance.
3. Discuss the signal distortion in optical fibres.
4. Explain the construction and working of a ruby laser with energy level diagram.
(4x5=20 Marks)


Part B: Answer two questions


5(a) Derive the time dependent Schrödinger’s wave equation for a free particle. (10 Marks)
(b) Explain with diagram how ultrasonics are generated by piezoelectric method. (5 Marks)

OR

6 (a) Setup the equation for the time independent Schrödinger’s equation. (10 Marks)
(b) Mention the properties of ultrasonics (5 Marks)


7 (a) Explain Hall effect. With necessary theory obtain the expression for the Hall coefficient and Hall voltage. (10 Marks)
(b) Explain Josephson effect. (5 Marks)
OR

8 (a) Discuss the effect of magnetic field on superconductors. (10 Marks)
(b) The Hall coefficient of a specimen of doped Si is found to be 3.36 x 10-4 m3/C. The resistivity of the specimen is 8.93 x10-3 Ωm. Find the mobility and the density of the charge carrier. (5 Marks)





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