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SECOND SEMESTER B.Sc. DEGREE EXAMINATION, MAY 2018
(CUCBCSS-UG)
Physics/Applied Physics
PHY 2B 02/APY 2B 02—PROPERTIES OF MATTER WAVES AND ACOUSTICS
Three Hours Maximum : 80 Marks

Section A

Answer all questions.
Each question carries 1 mark.

The apparatus used to find the rigidity modulus of the material of a wire is
Poisson’s ratio for steel if its Young’s modulus is 2 x 1011 N/m.? and rigidity modulus is

8 x 107° N/m.? is : ۱
(a) 0.25. (b) 0.15.
(c) 0.35. (d) 0.1.

For an undamped oscillator, the quality factor is

. At what displacement, the energy of a harmonic oscillator becomes half kinetic and half potential.

Give one example for a damped harmonic oscillator.

Which of the following is not an example for linear sample harmonics motion ?
(a) Vibration of atoms and molecules.
{b) Vibration of a tuning fork.

(c) Oscillations of a simple pendulum.
(d) Oscillations of a freely suspended magnet in a uniform magnetic field.

The velocity of transverse waves in a stretched string is given by

is transmitted by a wave.
(b) Velocity.

(d) Momentum.

(a) Amplitude.

(c) Energy.
Give the expression for intensity of a sound wave when expressed in terms of pressure amplitude

ए]. velocity v and density of air p.

The phenomenon of polarization is not observed in sound because, sound is wave.

(10 x 1 = 10 marks)