Problem: A sound wave in our classroom has speed of 380 m/s. There is a speaker at each end of the table that has 4.0 m length. Both speakers are emitting coherent waves at a frequency of 95 Hz. You are at a distance 3.0 m directly in front of one of the speaker.
What is the phase minimum phase difference between the waves arriving to you from the two speakers?
I want you to clarify the physics in this above problem.