Physics 15200- HW25

Physics 15200- HW25 - lai(yl8859 – HW25 – Ross...

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Unformatted text preview: lai (yl8859) – HW25 – Ross – (15200) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A sound wave has a frequency of 694 Hz in air and a wavelength of 0 . 55 m. What is the temperature of the air? As- sume the velocity of sound at 0 ◦ C is 331 m / s. Answer in units of ◦ C. 002 10.0 points By proper excitation, it is possible to pro- duce both longitudinal and transverse waves in a long metal rod. In a particular case, the rod is 101 cm long and 0 . 304 cm in radius and has a mass of 46 . 8 g. Find the required tension in the rod so that the ratio of the speed of longitudinal waves to the speed of transverse waves is 12. Young’s modulus for the material is 7 . 3 × 10 10 N / m 2 . Answer in units of N. 003 10.0 points A source of sound (1000 Hz) emits uniformly in all directions. An observer 2 . 5 m from the source measures a sound level of 27 . 8 dB....
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This note was uploaded on 02/24/2011 for the course PHYS 152 taught by Professor Button during the Winter '08 term at IUPUI.

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