1. The problem statement, all variables and given/known data 2 sources emitting radio waves of the same frequency are placed at x=0 meters and x = 1.2 meters. There are nodes at x= 0.344m, x= 0.719m, and x=1.094m. What is the frequency of the 2 sources and the difference in their phase constant 2. Relevant equations 3. The attempt at a solution Well i know that maximum destructive interference occurs for every 2pi increase in the difference in phase of the waves The difference in phase is: dФ = 2Pi (dr)/wavelength + dФ0 where dr is r2 - r1 = difference in radial distance between each source and the point in question now here is my problem: since dФ0 stays the same, it means that there will be a node for every increase in dr equal to one wavelength however, if i use those points mentioned above to find the radial difference for each point, i get dr1 = 0.512 dr2 = 0.238 dr3 = 0.988 so each one of these nodes has an increase in phase difference of 2Pi from the previous so taking the 2 with lower drs : dФ1 = 2Pi (0.238)/wavelength + dФ0 dФ2 = 2Pi (0.512)/wavelength + dФ0 = dФо+ 2Pi dФ2 - dФ1 = 2 pi = 2pi (0.512)/wavelength - 2Pi (0.238)/wavelength wavelength = 0.512 - 0.238 so the difference between 2 consecutive nodes should give me the wavelength ...but these are not evenly spaced, so if i use the 2nd set of points instead i get a different result (0.988 - 0.512 = 0.476) so I don't get it, where is my thinking going wrong?