1. The problem statement, all variables and given/known data In a large water tank experiment, water waves are generated with straight, parallel wave fronts, 3.00 m apart. The wave fronts pass through two openings 5.00 m apart in a long board. The end of the tank is 3.00 m beyond the board. Where would you stand, relative to the perpendicular bisector of the line between the openings, if you want to receive little or no wave action? 2. Relevant equations P(n) * S(1) - P(n) * S(2) = (n - 1/2) * wavelength sin ANGLE(n) = (n - 1/2) * wavelength / (distance between sources) x(n) / L = (n - 1/2) * wavelength / (distance between sources) 3. The attempt at a solution I really have no idea how to go about this. I've read through the section (Nelson Physics 12 text book) three or four times now. I don't see how the equations relate. The sample questions are similar, except they just ask to find the wavelength or speed of the waves. I know the answer is 1.25 m (from the back of the book), but I haven't a clue how to get it. Any help would be great! Thanks!