+244 Two loudspeakers emit a 444 Hz sound in-phase and are 4.0 m apart. A microphone is placed half-way between the speakers and then moved along the line joining the two speakers until the first point of constructive interference is found. How far away from the midpoint has the microphone moved? The speed of sound in air is 340 m/s.
A.0.38 m
B.0.28 m
C.0.58 m
D.0.78 m
E.There is no point in that line where constructive interference occurs.
