LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

   B.Sc. DEGREE EXAMINATION – PHYSICS

FIRST SEMESTER – NOVEMBER 2010

PH 1502/PH 1501 – PROPERTIES OF MATTER & ACOUSTICS

 

 

 

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

Time : 1:00 – 4:00

 

PART – A

 

Answer ALL questions                                                                                            (10 x 2 =20 marks)

 

1. Define Bulk modulus of elasticity with mathematical expression.
2. A load of 2 kg weight produces an extension of 1 mm in a wire of length 3 meters and 1 mm in diameter. Calculate the young’s modulus of the wire. (g = 9.8 m / s²)
3. Define stream line and turbulent motion of liquid.
4. Define co-efficient of viscosity. Give its S.I unit.
5. Define surface tension of a liquid. What are its dimensions and unit?
6. What is adhesion and molecular range in surface tension?
7. Explain the term wave motion. Distinguish between transverse and longitudinal wave motion.
8. What are beats?
9. What is piezoelectric effect?
10. Define reverberation.

PART – B

 

Answer any FOUR questions                                                                                     (4 x 7.5 =30 marks)

 

11. Derive the expression for the period of oscillation a torsion pendulum.                     (7.5)
12. Describe and explain the working of the rotatary oil pump.         (7.5)

 

13. a) Describe Jaeger’s method for determining the surface tension of a liquid.         (4.5)

 

1. b) Calculate the excess of pressure between the inside and outside of a soap bubble of

radius 1 cm surface tension of soap solution is 3.2 x 10^-2N /m.                                          (3)

 

14. a) Discuss the vibration of the air column in a closed organ pipe. (4)

 

50. b) Two open organ pipes of lengths 50 cm and 50.5 cm produce 3 beats / second.

Calculate the velocity of sound in air.                                                                      (3.5)

 

15. a) Write any two properties of ultrasonic waves. (2)

 

5. b) Explain how ultrasonics is produced in a magnetostriction oscillator.         (5.5)

 

PART – C

 

Answer any FOUR questions                                                                                                 (4×12.5=50 marks)

 

16. a) Describe Koenig’s method for the determination of young’s modulus of a beam. (9.5)

 

1. b) Find the amount of work done in twisting a steel wire of radius 10 ^-3 m and of length 0.25 m

through an angle of 45⁰. Given G for steel = 8 x 10¹⁰ Nm^-2.                                                        (3)

 

17. a) Derive Poiseuille’s formula for the rate of flow of a liquid through a capillary tube. (9.5)

 

1. b) Calculate the mass of water flowing in 10 minutes through a tube 0.001 m diameter and 0.4

m long if there is a constant pressure head of 0.2 m of water. The co-efficient of viscosity of

water is 0.00082 Nsm^-2                                                                                                                     (3)

 

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

mercury.                                                                                                                                           (9.5)

 

1. b) There is a minute circular hole at the bottom of a small hollow vessel. The vessel has to be

immersed in water to a depth of 0.4 m, before any water penetrates inside. Find the radius

of the holes, if the surface tension and density of water be 73 x 10^-3 Nm^-1 and 1000 kgm^-3

respectively.                                                                                                                                        (3)

 

19. a) Explain Doppler Effect.  (3)

 

1. b) Derive an expression for the change in frequency.

(i) Observer is at rest and source in motion (ii) Observer in motion and source is at rest and

(iii) Observer and source in motion and write the limitations of Doppler effect.                  (9.5)

 

20. a) Derive the Sabine’s formula for reverberation time.         (8)

 

4. b) Write a short note on noise reduction.                    (4.5)

 

 

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