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# Chapter 12 - sound in air at 0 ° C is 331 m/s What is the...

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Chapter 12 Sound Student: ___________________________________________________________________________ 2. A sound wave radiates from a source in all directions. If the power of the sound source is 200 watts, then the intensity level of the sound wave 100 m from the source is, in dB: A. 98.5. B. 92.0. C. 91.5. D. 89.6. E. 88.3. 25. The sound of a bird singing is given as 5 dB. What is the intensity of the sound of a bird singing? A. 1.95 × 10 -12 W/m 2 B. 2.04 × 10 -12 W/m 2 C. 2.98 × 10 -12 W/m 2 D. 3.16 × 10 -12 W/m 2 E. 4.25 × 10 -12 W/m 2 28. A 3.0 m organ pipe is open at both ends and contains air. The velocity of sound in air is 331 m/s. What is the wavelength of the lowest frequency mode? A. 1.5 m B. 3.0 m C. 6.0 m D. 9.0 m E. 12.0 m 31. Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is: A. twice as great. B. the same. C. one half as great. D. None of the choices is correct.

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39. A 20 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of
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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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Chapter 12 - sound in air at 0 ° C is 331 m/s What is the...

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