1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Frequency question

  1. Jan 11, 2010 #1
    URGENT!!!! Frequency question

    1. The problem statement, all variables and given/known data
    A radio antenna for an AM station is 75m high tower that is equivalent to lamda/4; another lamda/4 corresponds to ground reflection. At what frequency does the station transmit?


    2. Relevant equations
    v=f(lamda)
    E=cB

    3. The attempt at a solution

    Actually, I am not sure what equation to use!?

    Please help..I think it's a simple question if i know the equation
     
  2. jcsd
  3. Jan 11, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Re: URGENT!!!! Frequency question

    What is the velocity of radio waves?
    Use the relevant equation to find f.
     
  4. Jan 11, 2010 #3
    Re: URGENT!!!! Frequency question

    THe answer is 1M Hz..v=f lamda
    is not the right equation to use?
     
  5. Jan 11, 2010 #4

    rl.bhat

    User Avatar
    Homework Helper

    Re: URGENT!!!! Frequency question

    The formula is correct. In the problem wavelength λ = 2*150m. What is the velocity of radio waves?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook