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Unformatted text preview: khounvivongsy (sk27799) Practice Problems 3 Weathers (17104) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Two harmonic waves are described by y 1 = A sin( k x- t ) , y 2 = A sin( k x + t ) , where A = 6 . 7 mm, k = 4 . 9 rad / m and = 3100 rad / s. What is the amplitude y max ( x ) of the resul- tant wave at x = 1 . 52 m? Answer in units of mm. 002 10.0 points Two harmonic waves are described by y 1 = A sin(3 x- 5 t ) , y 2 = A sin(3 x- 5 t- 4) . A = 11 m, with x and t being given in SI units and the phase angles in radians. What is the displacement of the sum of these two harmonic waves, y 1 + y 2 , at x = 1 m, t = 1 s? Answer in units of m. 003 10.0 points Two identical harmonic waves with wave- lengths of 3 . 2 m travel in the same direction at a speed of 3 . 5 m / s. The second wave origi- nates from the same point as the first, but at a later time. Determine the minimum possible time in- terval between the starting moments of the two waves if the amplitude of the resultant wave is the same as that of the two initial waves. Answer in units of s. 004 (part 1 of 2) 10.0 points The acoustical system shown in the figure is driven by speaker emitting a 392 Hz note....
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This note was uploaded on 05/09/2010 for the course PHYS 1710 taught by Professor Weathers during the Spring '09 term at University of North Carolina Wilmington.
- Spring '09