Physics B.Sc. 4th-Semester CBCS Previous Year Old Question Paper Jammu University, Under Graduation

B.Sc. IV Semester Degree Examination
CBS-IVS/5

214688

PHYSICS

Course No. UPHTC-401

Time Allowed: 2½ hours                                                                     Maximum Marks: 80

Note:   Attempt all questions from Section A and Section B and any two questions from Section C.

Section - A

1. Show that f(x) contains only sine terms for old functions.

2. What do you understand by superposition principle?

3. In a Newton’s rings experiment, the diameter of 10^th dark ring due to wavelength 6000 Å in air is 0.5 cm. Calculate the radius of curvature of lens.

4. In a Fraunhofer diffraction pattern due to a narrow slit, a screen is placed 2m away from the lens. If the slit width is 0.2 mm and the first minimalie 5 mm on either sides of the central maximum, find the wavelength of light.

5. Explain Malas Law.

Section - B

1. Discuss how the interval of fourier expansion is extended from (-π,π) to (-1, 1) for a periodic function f(x).

2. Derive an expression for the velocity of transverse waves in a sting.

3. Find an expression for fring width in case of young’s double slit experiment.

4. What is a zone plate? Derive an expression for its focal length.

5. State and derive Brewster’s law.

Section - C

1. State properties of Fourier series. Give analysis of square wave in terms of Fourier coefficients.

2. Explain the terms plage velocity and group velocity are identical for a non - dispersive medium.

3. Describe construction and working of michelson interferometer. How will you use it to determine wavelength of monochromatic light?

4. i) Derive an expression for dispersive power of granting.

ii) What is Rayleigh’s criterion for resolution? Derive an expression for the resolving power of granting.

5. Define specific rotation. Describe the construction and working of Laurents half - shade polarimeter. Explain how it is used to determine the specific rotation of sugar solution.

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