In Fig. 17-37, two speakers separated by distance d1 2.00 m are in phase. Assume the

Chapter 17, Problem 21

(choose chapter or problem)

In Fig. 17-37, two speakers separated by distance d1 2.00 m are in phase. Assume the amplitudes of the sound waves from the speakers are approximately the same at the listeners ear at distance d2 3.75 m directly in front of one speaker. Consider the full audible range for normal hearing, 20 Hz to 20 kHz. (a) What is the lowest frequency fmin,1 that gives minimum signal (destructive interference) at the listeners ear? By what number must fmin,1 be multiplied to get (b) the second lowest frequency fmin,2 that gives minimum signal and (c) the third lowest frequency fmin,3 that gives minimum signal? (d) What is the lowest frequency fmax,1 that gives maximum signal (constructive interference) at the listeners ear? By what number must fmax,1 be multiplied to get (e) the second lowest frequency fmax,2 that gives maximum signal and (f) the third lowest frequency fmax,3 that gives maximum signal? SpeakersListenerd1d 2 Figure 17-37 21.