LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

CC 02

FIRST SEMESTER – November 2008

PH 1501 – PROPERTIES OF MATTER & ACOUSTICS

 

 

 

Date : 10-11-08                     Dept. No.                                        Max. : 100 Marks

Time : 1:00 – 4:00

PART-A

 

Answer ALL questions:                                                          10 x 2 = 20 marks

 

1. State Hooke’s law of elasticity.
2. Define Poisson’s ratio. What are the theoretical limits of its value?
3. Differentiate streamlined motion from turbulent motion
4. Give two properties of a good lubricant
5. Define surface tension of a liquid Give it’s unit.
6. Calculate the excess pressure inside an air bubble of diameter 0.2 mm which is surrounded on all sides by water of surface tension 0.07 N/m
7. What are beats?
8. What is Piezo electric effect ?
9. Define reverberation time..
10. State the principle of superposition.

 

PART-B

Answer any FOUR questions:                                                4 x 7.5 = 30 marks

 

11. Calculate the bending moment for a beam of cross sectional area ‘A’, which forms part of a circle of radius ‘R’. The Young’s modulus of the material of the beam is ‘q’.
12. Describe the working of a mercury diffusion pump.
13. Describe the Jaeger’s method for determining the surface tension of a liquid.
14. Find the reflection and transmission amplitude coefficient for a transverse wave at the boundary of two strings.
15. What are ultrasonic waves?, How are they produced using a magnetostriction oscillator.

PART-C

Answer any FOUR questions:                                                4 x 12.5 = 50 marks

 

16. a). Calculate the torsional couple required to twist a wire through an angle ‘ q’

b). If a circular disc of moment of inertia ‘I’ is suspended at the end of the wire of length

‘l’, calculate the time period of oscillations and  hence the rigidity modulus of the

material of the wire.

 

 

 

 

 

17. a) Describe the Rankine’s method to determine the viscosity of a given gas.

b). Olive oil in a tall cylinder is made to flow through a horizontal capillary tube

connected to the cylinder 50 cm below the surface of the liquid. If the tube is 10 cm

long and 2mm in diameter how much oil will flow through in 20 second?, Density of

olive oil is 0.918 gm/cc ; viscosity of olive oil is 0.08 Ns/m²

18  a). Calculate the work done in increasing the radius of a spherical soap bubble from

1cm to 5 cm. Surface tension of soap solution is 0.028 N/m.

b). Describe Quincke’s method to determine the surface tension and angle of contact of

mercury.

19. a). What is Doppler effect? Derive the formula for the change in frequency (i) When the

source is moving towards the stationary observer. (ii) When the source is moving

away from stationary observer. (iii) When the observer is moving towards the

stationary source. (Iv) When the observer is moving away from the source.

b). Find the vibrating length of the wire if it vibrates at 50 Hz subjected to a tension of

1 Newton. The linear density of the wire is 1.53 x 10^-3 kg/m.

20. a). Define the absorption coefficient of sound wars for material.

b). How is it determined experimentally?

c). Give the conditions for good acoustics in an auditorium.

 

 

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