sound waves, like light waves, can interfere with each other, giving maximum and minimum levels of sound. suppose a listener standing directly between two loud speakers hears the same tone being emitted from both. this listener observes that when one of the speakers is moved 0.700 m farther away, the perceived intensity of the tone decreases from a maximum to a minimum. (a) calculate the wavelength of the sound. (b) calculate its frequency, using 343 m s-1 as the speed of sound.