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Foxhole radio problems that are way over my head!

  1. Jun 17, 2011 #1
    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.
     
  2. jcsd
  3. Jun 17, 2011 #2
    wait am i in the wrong section or...
     
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