Chapter 17, Problem 2Q

In Fig. 17-25, two point sources S₁, and S_2, which are in phase, emit identical sound waves of wavelength 2.0 m. In terms of wavelengths, what is the phase difference between the waves arriving at point P if (a) L₁ = 38 m and L₂ = 34 m. and (b) L₁ = 39 m and L₂ = 36 m? (c) Assuming that the source separation is much smaller than L₁ and L₂, what type of interference occurs at P in situations (a) and (b)?

Figure 17-25 Question 2.