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Two audio speakers are kept some distance apart and are driven by the same amplifier system. A person is sitting at a place 6.0 m from one of the speakers and 64 in from the other. If the sound signal is continuously varied from 500 Hz to 5000 Hz, what are the frequencies for which there is a destructive interference at the place of the listener? Speed of sound in air = 320 m/s.

The path difference of the two sound waves is:ΔL = 6.4 - 6.0 = 0.4 mThe wavelength of either wave = λ = v/f = (320/f) m/sFor destructive... View Article