SNGCET PAYYANUR

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First Assignment 2007-2008 EN2K6 102:ENGINEERING PHYSICS

Sree Narayana Guru College of Engineering and Technology, Payyanur
First Assignment 2007-2008
EN2K6 102:ENGINEERING PHYSICS

Answer any 10 of the following questions

1. A soap film 5x10-5 cm thick is viewed at an angle of 350 to the normal. Find the wavelength of light in the visible spectrum which will be absent from the reflected light. Given μ =1.33 (2006)
2. Discuss with necessary theory, the Newton’s rings experiment to determine the wavelength of sodium light. (2005)
3. Explain why the center of Newton’s rings is dark in the reflected system.
4. In a Newton’s rings system a convex lens of radius of curvature 1m is placed in contact with a flat plate. Calculate the radii of (1) the 3rd dark ring and (2) the 3rd bright ring of the interference pattern produced by the light of wavelength 5000 Å. (2004)
5. Explain how the wavelength of the sodium light is determined by forming wedge shaped air film. Derive the formula used. (2004,2007)
6. Explain how optical planeness of surfaces can be tested. (2006)
7. An air wedge of angle 0.01 rad is illuminated by monochromatic light of 600 nm falls normally on it. At what distance form the edge of the wedge will the 5th fringe be observed by the reflected light. (2007)
8. An air wedge of angle 0.01 rad is illuminated by monochromatic light of 6000 Å falls normally on it. At what distance form the edge of the wedge will the 10th fringe be observed by the reflected light. (2005)
9. Explain Fresnel’s and Fraunhoffer diffraction. (2004,2005)
10. Describe the theory of a plane transmission grating and describe how it is used to determine the wavelength of light. (2006,2007)
11. What is the highest order spectrum, which may be seen with monochromatic light of wavelength 6000 Å by means of a diffraction grating with 5000 lines/cm. (2006)
12. What are the differences between interference and diffraction bands?
13. Calculate the angular separation of two spectral lines of mercury of wavelengths 5770 Å and 5791 Å in the second order when a grating having 6x105 lines/m is used.
14. Describe double refraction in crystals. (2004,2007).
15. Write a brief note on half wave plate. (2006)
16. Explain how plane polarized light is produced and detected. (2005)
17. Write briefly how elliptically polarized light can be detected. (2005)
18. Explain with necessary theory the production and detection of circularly polarized light. (2004, 2005)
19. Calculate the specific rotation if the plane of polarization is turned through 26.40 traversing 20cm length of 20% sugar solution. (2004,2005)
20. Explain optical activity and specific rotation. Describe how half shade polarimeter is used to determine the specific rotation of glucose. (2006)
21. Write any four applications of polarized light. (2004)

LAST DATE FOR SUBMISSION: 10-01-2008

First Assignment 2006-2007 ENGINEERING PHYSICS (A)

Sree Narayana Guru College of Engineering and Technology, Payyanur
First Assignment 2006-2007
ENGINEERING PHYSICS (A)

1.Explain Fresnel’s and Fraunhoffer diffraction. (2004,2005)
2.Write any four applications of polarized light. (2004)
3.Describe double refraction in crystals. (2004).
4.Explain zero point energy. (2004)
5.Explain how the wavelength of the sodium light is determined by forming wedge shaped air film. Derive the formula used. (2004)
6.In a Newton’s rings system a convex lens of radius of curvature 1m is placed in contact with a flat plate. Calculate the radii of (1) the 3rd dark ring and (2) the 3rd bright ring of the interference pattern produced by the light of wavelength 5000 Å. (2004)
7.Explain with necessary theory the production and detection of circularly polarized light. (2004,2005)
8.Calculate the specific rotation if the plane of polarization is turned through 26.40 traversing 20cm length of 20% sugar solution. (2004,2005)
9.Derive the time dependent Schrödinger’s wave equation for a free particle. (2004)
10.Explain the basic principle of electron spin resonance. (2004,2006)
11.Explain with diagram how ultrasonics are generated by piezoelectric method. (2004,2005,2006)
12.Mention the properties of ultrasonics. (2004,2005)
13.Write briefly how elliptically polarized light can be detected. (2005)
14. Discuss with necessary theory, the Newton’s rings experiment to determine the wavelength of sodium light. (2005)
15. An air wedge of angle 0.01 rad is illuminated by monochromatic light of 6000 Å falls normally on it. At what distance form the edge of the wedge will the 10th fringe be observed by the reflected light. (2005)
16.Explain how plane polarized light is produced and detected. (2005)
17.Explain a wavefunction(2005,2006)
18.Setup the equation for the time independent Schrödinger’s equation. (2005)
19.With the basic principle explain any one application of NMR. (2005)
20.Mention the applications of ultrasonics. (2005,2006)
21.Write a brief note on half wave plate. (2006)
22.Explain how optical planeness of surfaces can be tested. (2006)
23.Describe the theory of a plane transmission grating and describe how it is used to determine the wavelength of light. (2006)
24.What is the highest order spectrum, which may be seen with monochromatic light of wavelength 6000 Å by means of a diffraction grating with 5000 lines/cm. (2006)
25.Explain optical activity and specific rotation. Describe how half shade polarimeter is used to determine the specific rotation of glucose. (2006)
26.A soap film 5x10-5 cm thick is viewed at an angle of 350 to the normal. Find the wavelength of light in the visible spectrum which will be absent from the reflected light. Given μ =1.33 (2006)
27.Distinguish between Newtonian and quantum mechanics. By assuming time independent Schrödinger’s equation find eigen values and eigen functions for a particle in a box. (2006)
28.Explain the methods of detecting ultrasonics. (2006)

LAST DATE FOR SUBMISSION: 02-02-2007

First Assignment 2006-2007 ENGINEERING PHYSICS (B)

Sree Narayana Guru College of Engineering and Technology, Payyanur
First Assignment 2006-2007
ENGINEERING PHYSICS (B)

1.What is interference of light? Give the conditions for sustained interference. (2004)
2.Explain the phenomenon of double refraction. (2004)
3.Write a short note on Moire fringes. (2004,2005)
4.What are the differences between spontaneous and stimulated emission. (2004,2005,2006)
5.Discuss with necessary theory, the Newton’s rings experiment to determine the wavelength of monochromatic light. (2004)
6.Given the diameter of two successive bright rings in Newton’s ring experiment using the wavelength of 5890 Å as 0.02m and 0.0202m. Calculate the radius of curvature of the plano convex lens.(2004)
7.Give the analytical treatment to distinguish between plane, circular and elliptically polarised light. (2004)
8.Plane polarised light passes through a quartz plate with its axis parallel to the face. Calculate the thickness of the plate so that the emergent light may be plane polarised. The wavelength of the light is 5500 Å and for quartz, μe = 1.553 and μo = 1.542. (2004,2006)
9.What are isochromatics and isoclinics? Give the mathematical analysis of them. (2004,2005,2006)
10. Arrive at stress-optic relations for two-dimensional case. (2004,2006)
11.Describe the principle, construction and working of He-Ne laser with energy level diagram. (2004,2005,2006)
12.Explain the basic principle of Holography. Mention its applications. (2004,2005,2006)
13.Explain Fresnel’s and Fraunhoffer diffraction. (2005.2006)
14.Describe the construction of Nicol prism. (2005)
15.Explain the phenomenon of photoelasticity. (2005)
16.Find an expression for the width of the fringes obtained in the case of air wedge. How do you use the result to find the wavelength of a given monochromatic radiation? (2005)
17.An air wedge of angle 0.01 rad is illuminated by monochromatic light of 6000 Å falls normally on it. At what distance form the edge of the wedge will the 10th fringe be observed by the reflected light. (2005)
18.State Brewster’s law and explain the phenomenon of double refraction. (2006)
19.Explain the stress and strain at a point. (2006)
20.Give the theory of plane diffraction grating for normal incidence. (2006)
21.A plane grating has 5096 lines per cm. Find the angle of seperation of 5048 Å and 5016 Å lines of helium in the second order spectrum.(2006)
22.What are quarter and half wave plates? Describe how elliptically and circularly polarised light are obtained?(2006)
23.Why population inversion is essential in laser action? (2006)
24.How does holography differ from photography? (2006)

LAST DATE FOR SUBMISSION: 09-02-2007