1. The problem statement, all variables and given/known data Two speakers (S1,S2), emitting sound waves of frequency 340Hz and separated by a distance of 3 m, are driven by the same oscillator. A listener starts walking from point A to S2 Along the line that joins A and S2> How many points of destructive interference will be observe? Speed of sound in are is 340 m/s 2. Relevant equations w=v/f 3. The attempt at a solution Although, it seems quite easy,I've tried to solve it many times with no reasonable result, Wavelength will be 1 meter. And I don't know how to do after that. the right answer is 4 but how it comes??