Two point sources of sound are kept at a separation of 10 cm. They vibrate in phase to produce waves of wavelength 5.0 cm. What would be the phase difference between the two waves arriving at a point 20 cm from one source (a) on the line joining the sources and (b) on the perpendicular bisector of the line joining the sources?

Question

Philoid · Accepted Answer

Given:
Separation between the two point sources
Wavelength

(a) Phase difference is given by:

So,

Therefore, the phase difference is zero.

(b) Zero: the particles are in the same phase since they have the same path.