Example 1

2-4 Interference

Two sound waves from two different sources with the same frequency, 350Hz, travel at a speed of 330 m/s. The sources are in phase. What is the phase difference of the waves at a point that is 6.50 m from one source and 5.00 m from other? The waves are traveling in the same direction.

The phase difference is rad

Answer

The phase difference Dfis related to the path length DL difference through the relationship:

Since f = 350 Hz, v = 330 m/s,