1. The problem statement, all variables and given/known data Two point sources S1 and S2 emit idential sound waves of frequency 171.5 Hz as shown to the right. In terms of wavelength, what is the difference in the path length between the waves arriving at point P if a) L1 = 38m and L2 = 34 m b) L1 = 39m and L2 = 36m 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? *There is a picture: The paths of waves emitted from points S1 and S2 are straight lines that are converging twrds each other and intersect at P. Its sort of a triangle, w/ P at the vertex 2. Relevant equations wavelength = f *v f = nv/2L --> n is harmonic number, but its not given? 3. The attempt at a solution From that 2nd equation, I worked out that L = [tex]\lambda[/tex]n/2 But I really don't understand what the question is asking. If the waves are identical, than how is their path length changed? And how do you express it "in terms of lambda"?