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# problem_pdf - pokharel(pp7242 Waves and Sound walther(16180...

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pokharel (pp7242) – Waves and Sound – walther – (16180) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. First Assignment 001 10.0 points Sound in air can best be described as which of the following type of wave? 1. Electromagnetic 2. Torsional 3. Polarized 4. Longitudinal 5. Transverse 002 (part 1 of 2) 10.0 points A standing wave of frequency 5 hertz is set up on a string 2 meters long with nodes at both ends and in the center, as shown. 2 meters Find the speed at which waves propagate on the string. 1. 5 m / s 2. 20 m / s 3. 10 m / s 4. 2 . 5 m / s 5. 0 . 4 m / s 003 (part 2 of 2) 10.0 points Find the fundamental frequency of vibration of the string. 1. 2 . 5 Hz 2. 5 Hz 3. 1 Hz 4. 7 . 5 Hz 5. 10 Hz 004 10.0 points The graph below represents the potential en- ergy U as a function of displacement x for an object on the end of a spring ( F = - k x ) oscillating in simple harmonic motion with amplitude x max . + x max - x max x U U max Which graph represents the kinetic energy K of the object as a function of displacement x ? 1. + x max - x max x K K max 2. + x max - x max x K K max 3. + x max - x max x K K max

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pokharel (pp7242) – Waves and Sound – walther – (16180) 2 4. + x max - x max x K K max 5. + x max - x max x K K max 6. + x max - x max x K K max 7. + x max - x max x K K max 005 10.0 points An ideal massless spring is fixed to the wall at one end, as shown below. A block of mass M attached to the other end of the spring oscillates with amplitude A on a frictionless, horizontal surface. The maximum speed of
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