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Chapter 17: Q42P (page 509)
A sound wave in a fluid medium is reflected at a barrier so that a standing wave is formed. The distance between nodes is , and the speed of propagation is. Find the frequency of the sound wave.
The frequency of the wave is
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Question: Two loud speakers are located 3.35 mapart on an outdoor stage. A listener is18.3m from one andfrom the other. During the sound check, a signal generator drives the two speakers in phase with the same amplitude and frequency. The transmitted frequency is swept through the audible range 20Hz to 20 KHz. (a) What is the lowest frequency fmin1that gives minimum signal (destructive interference) at the listener鈥檚 location? By what number must fmin1be multiplied to get(b)The second lowest frequencyfmin2that gives minimum signal and(c)The third lowest frequencyfmin3that gives minimum signal ?(d)What is the lowest frequencyfmin1that gives maximum signal (constructive interference) at the listener鈥檚 location ? By what number mustfmin1be multiplied to get(e) the second lowest frequencyfmin2that gives maximum signal and(f) the third lowest frequencyfmin3that gives maximum signal?
A 2000Hzsiren and a civil defense official are both at rest with respect to the ground. What frequency does the official hear if the wind is blowing at 12m/s.(a) from source to official and (b) from official to source?
An ambulance with a siren emitting a whine at 1600Hzovertakes and passes a cyclist pedaling a bike at 2.44m/s. After being passed, the cyclist hears a frequency of 1590Hz. How fast is the ambulance moving?
Question: When the door of the Chapel of the mausoleum in Hamilton, Scotland, is slammed shut, the last echo heard by someone standing just inside the door reportedly comes 15 slater. a) If that echo were due to a single reflection off a wall opposite the door, how far from the door is the wall? (b) If, instead, the wall is 25.5 maway, how many reflection (back and forth) correspond to the last echo?
Two sounds differ in sound level by. What is the ratio of the greater intensity to the smaller intensity?
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