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Unformatted text preview: sound in air at 0 ° C is 331 m/s. What is the wavelength of the fundamental mode? A. 40 cm B. 60 cm C. 80 cm D. 43 cm E. 75 cm 65. An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the ambulance is stationary, what is the frequency of the siren perceived by the observer? A. 2,640 Hz B. 2,559 Hz C. 2,324 Hz D. 2,139 Hz E. 2,003 Hz 66. An ambulance is generating a siren sound at a frequency of 2,000 Hz. The velocity of sound is 345.0 m/s. The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s. If the observer is stationary, what is the frequency of the siren perceived by the observer? A. 2,032 Hz B. 2,150 Hz C. 2,220 Hz D. 2,575 Hz E. 2,750 Hz...
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 Fall '09
 ZHIXIANZHOU,
 Power, Hertz, Hz

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