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: Find its signal wavelength

  1. Dec 3, 2005 #1
    A FM radio station has a frequency of 106.5MHz. Find its signal wavelength.

    I am guessing that you would use the speed of sound in this problem correct me if I am wrong.

    So Wavelength=v/f

    Is this right?
  2. jcsd
  3. Dec 3, 2005 #2


    User Avatar
    Gold Member

    No, you use the speed of a photon which is ~3.0 x 10^8. A radio station broadcasts a radio signal, not a sound signal or else you could hear it by stepping out of your car :)
  4. Dec 3, 2005 #3


    User Avatar
    Homework Helper
    Gold Member

    No, not the speed of sound.
    Radio is the wireless transmission of signals, by modulation of electromagnetic waves.
  5. Dec 3, 2005 #4
    Well that makes sense; although, it would be nice to hear the radio when you stepped out of your car. So wavelength=v/f=3.0e8/1.065e8=2.82m right??
  6. Dec 4, 2005 #5


    User Avatar
    Gold Member

    Yup that is right.
  7. Dec 4, 2005 #6
    Thanks so much!!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook