1. The problem statement, all variables and given/known data A steep cliff west of Lydia's home reflects a 1205 kHz radio signal from a station that is 63 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180° phase shift when the wave reflects from the cliff. 2. Relevant equations delta l = (m + .5) * wavelength delta l = d sin theta A = l A1 - A2 l I = I1 + I2 - ( 2 * (square root of I1 * I2)) 3. The attempt at a solution I have no idea how to start, I know I can find the wavelength but unsure how that relates to distance or how to find the distance from that.