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Two Antennas

  1. Feb 5, 2014 #1
    1. The problem statement, all variables and given/known data
    Two antennas located at points A and B are broadcasting radio waves of frequency 99.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d= 12.40 m. An observer, P, is located on the x axis, a distance x= 58.0 m from antenna A, so that APB forms a right triangle with PB as hypotenuse. What is the phase difference between the waves arriving at P from antennas A and B? Now observer P walks along the x axis toward antenna A. What is P's distance from A when he first observes fully destructive interference between the two waves? If observer P continues walking until he reaches antenna A, at how many places along the x axis (including the place you found in the previous problem) will he detect minima in the radio signal, due to destructive interference?


    2. Relevant equations



    3. The attempt at a solution
    I got part A, which is 2.718 rad

    http://lon-capa.bd.psu.edu/res/msu/physicslib/msuphysicslib/75_Interf_Diffrac1/graphics/prob08a_antennas.gif
     
    Last edited by a moderator: Feb 6, 2014
  2. jcsd
  3. Feb 6, 2014 #2

    berkeman

    User Avatar

    Staff: Mentor

    I'm not able to see the image. Can you upload it as an attachment?
     
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