1. The problem statement, all variables and given/known data A radio station transmits 680kHz at a power of 50000W from a transmitter. Estimate the strength of the signal as it was received by the antenna 35 km away. 2. Relevant equations I don't know any equation for this that's the problem! 3. The attempt at a solution I can't find the relation between frequency, power and distance anywhere in my textbook T_T. My teacher is evil T_T. This is an AP course btw T_T.