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Pune University - SY BSc (Sem - II) PHYSICS - I, April 2010

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Total No. of Questions : 4] P481 [Total No. of Pages : 2 [3717] - 203 S.Y. B.Sc. PHYSICS PH - 221 : Oscillations, Waves and Sound (Paper - I) (Sem. - II) (New Course) Time : 2 Hours] Instructions to the candidates: 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of calculator and log tables allowed. 4) Neat diagrams must be drawn wherever necessary. [Max. Marks : 40 Q1) Attempt all of the following : a) Explain stable equilibrium. [1] b) What is meant by overdamped motion? [1] c) What is a resonance? State the condition for amplitude resonance. [1] d) Explain transverse waves in brief. [1] e) What is red shift? [1] f) Explain the quality of a sound. [1] g) An oscillator of mass 0.02kg oscillating with the amplitude 0.1m and [1] frequency 50Hz. What is its energy? h) The equation of motion in the critically damped motion is given in the i) j) d 2x dx [1] form 3 2 + 24 + kx = 0 find the value of k. dt dt What are coupled oscillations? [1] The velocity of transverse waves over a stretched string is 100 cm/s. If its mass per unit length is 5 g/cm, find tension in the string. [1] Q2) Attempt any two of the following : a) Derive the condition for velocity resonance and obtain amplitude of velocity at resonance. [5] b) Show that average energy of oscillator in damped oscillations is 1 E = ka 2e 2 c) Rt m [5] Describe Rayleigh disc method to determine intensity level of sound. [5] P.T.O.

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Additional Info : S.Y. B.Sc. Physics (Semister - II), PH - 221 : Oscillation, Waves and Sound (Paper - I) (New Course), Pune University
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