Q. 3. Sound waves are generated by a source and they spread radially outwards. If a person is at a distance d from the source then walk 40 m towards the source and finds that the intensity has doubled. What will be the value of d. 

G 3G 85% 8:05 AM Edit 45 Department of Physics/FBAS International Islamic University Islamabad Terminal Exam. Spring 2020 Waves and Oscillations-PHY211 (RS-III) Total Marks: 60 Tine allowed: 8 hours Note: Attempt all questions. Avoid sharing your answers with each other. Copied solutions can pole ntially reduce your marks. Q. 1. (a) Consider a rod of length L which oscillates about a pivot as shown in figure. For what value of r the frequency of oscillations is a maximum? (b) A point object having mass 2 kg performs ID simple harmonic motion described by the equation y = 4 cos Gt-) For what value of y is the kinetic energy of the particle equal to half the total energy? How long will the object take to move to position y firom equilibrium position? JAll quantities are in SIunits] Q. 2. (a) Two sinusoidal waves of the same frequency travel in the same drection along a stretched string. Their amplitudes are 3.0 mm and 6.0 mm respectively; they produce a resultant wave with amplitude of 7.0 nm. The phase constant of the 3.0 mm wave is 0. What is the phase constant of the 6 0 mm wave? (b) A string oscillte according to the equation y' = (005m)sin (G x 10-m-" )x]cos( (40rs")0) What are the amplitudes of the individual waves? Q. 3. Sound waves are generated by a source and they spread radially outwards. IT a person is at a distance d from the source then walk 40 m towards the source and finds that the intensity has doubled. What will be the value of d. DD DO W Tools Mobile View Share PDF to DOC O