lai (yl8859) – HW25 – Ross – (15200)1Thisprint-outshouldhave9questions.Multiple-choice questions may continue onthe next column or page – find all choicesbefore answering.00110.0 pointsA sound wave has a frequency of 694 Hz in airand 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.00210.0 pointsBy proper excitation, it is possible to pro-duce both longitudinal and transverse wavesin a long metal rod. In a particular case, therod is 101 cm long and 0.304 cm in radius andhas a mass of 46.8 g.Find the required tension in the rod so thatthe ratio of the speed of longitudinal waves tothe speed of transverse waves is 12. Young’smodulus for the material is 7.3×1010N/m2.Answer in units of N.00310.0 pointsA source of sound (1000 Hz) emits uniformlyin all directions. An observer 2.5 m from thesource measures a sound level of 27.8 dB.
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