In the figure, two loudspeakers, separated by a distance of di = 2.95 m, are in phase. Assume the amplitudes of the sound from the speakers are approximately the same at the position of a listener, who is dy = 4.44 m directly in front of one of the speakers. Consider the audible range for normal hearing, 20 Hz to 20 kHz. (a) What is the lowest frequency that gives the minimum signal (destructive interference) at the listener's ear? (b) What is the lowest frequency that gives the maximum signal (constructive interference) at the listener's ear? (Take the speed of sound to be 343 m/s.) Speakers Listener de (a) Number i 115.1 Units Hz (b) Number i 230.2 Units Hz