Question

Two sources of sound are separated by a distance 4 m. They both emit sound with the same amplitude and frequency (330 Hz), but they are 180º out of phase. At what points between the two sources, will the sound intensity be maximum?

Answer 1

∴ λ  = v/n = 330/330 = 1 m

Directly at the cenre of two sources of sound, path difference is zero. But since the waves are 180° out of phase, two maxima on either sides should be at a distance of λ /4  from the point at the centre. Other maxima will be located each λ/2   further along.

Thus, the sound intensity will be maximum at ± 0.25, ± 0.75, ± 1.25 and ±1.75 m from the point at the centre.