Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Is it necessary for coherent waves to have same frequency?

  1. Jul 11, 2011 #1
    i mean what more are coherent waves except 'having constant phase differnce'?i mean it is nt necessay for them to be in phase .they can be out of phase but must have a cnsstant phase diff. say pie/2 radian
    so what i mean to ask is that is it necessary for coherent waves to be of same frequency. cant they be of differnt frewuency? bcoz even if they are of differnt frequency like say one is a multiple of other like twice of it even then the condition of CONSTANT PHASE DIFFERENCE be satisfied?
    so shortly is it necessary that the coherent waves have same frequency or can they have frequencies dat are whole multiples of each other(256 , 512)?
    also what abt their amplitude?
  2. jcsd
  3. Jul 11, 2011 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    2018 Award

    See here: http://en.wikipedia.org/wiki/Coherence_(physics [Broken])
    Last edited by a moderator: May 5, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook