LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – CHEMISTRY

RO 31

SECOND SEMESTER – APRIL 2008

PH 2103 – PHYSICS FOR CHEMISTRY

 

 

 

Date : 25/04/2008                Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

 

SECTION – A

Answer all the questions                                                                   (10 x 2 = 20 Marks)

 

1. What are holonomic and non-holonomic constraints?
2. Sketch the displacement – time graph and velocity – time graph.
3. What is meant by parking orbit for a satellite?
4. State the Principle of equivalence of the general theory of relativity.
5. Define surface tension and give its unit.
6. Calculate the rigidity modulus and Poisson’s ratio for silver.

(Given, Young¢s modulus = 7.25 x 10¹⁰ N/m² and bulk modulus = 11 x 10¹⁰ N/m²)

1. What are optically active materials? Give two examples.
2. In Fraunhoffer diffraction pattern due to a narrow slit, a screen is placed 2m away from the lens to obtain the pattern. If the slit width is 0.2 mm and the first minima lies 5 mm on either sides of the central maximum, find the wavelength of light.
3. Define unit cell.
4. Define lattice and basis.

 

SECTION – B

Answer any Four questions                                                             (4 x 7.5 = 30 Marks)

 

1. Obtain expressions for time of flight, greatest height and range of a projectile motion.
2. Discuss qualitatively any two experimental tests of general theory of relativity.
3. Obtain an expression for the excess of pressure inside

• a spherical soap bubble
• a spherical liquid drop

 

1. Explain the use of a plane transmission grating to measure wavelength of a spectral line.
2. State Bragg’s law. Explain the Laue method of X-ray diffraction.

 

SECTION – C

 

Answer any Four questions                                                 (4 x 12.5 = 50 Marks)

 

1. Set up the Lagrangian and solve the Lagrange’s equation of motion for

1. Atwood’s machine  (6 marks)
2. Simple pendulum (6 ½ marks)

1. a) Describe an accurate method of determining the value of the gravitational constant G.

1. b) Assuming the mean density of the earth as 5500 Kg/m³ and that the earth’s radius as 6400 km, find a value for the acceleration of free fall at the earth’s surface. Derive the formula used.

(G = 6.7 x 10^-11 Nm² Kg^-2)                                                    (7 + 2 ½ + 3 marks)

1. Describe Quincke’s Method of finding surface tension. Derive the formula employed.
2. Explain the production and detection of

• Plane polarized light (3 ½ Marks)
• Circularly polarized light (4 ½ Marks)
• Elliptically polarized light (4 ½ Marks)

1. Write about Miller indices. Explain the body centered cubic and face centered cubic crystal structures.

 

 

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