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Homework Help: Period of a monocromatic light?

  1. Feb 1, 2007 #1
    1. The problem statement, all variables and given/known data

    What is the period of a monochromatic light with a wavelength of 660nm?

    2. Relevant equations

    T= 1/f (I think?)

    3. The attempt at a solution

    T = 1/660nm
    The period of this monochromatic light is 0.00152 waves/nm.
    Firstly, I don't know for sure that the variable T is equal to period, as this is review of last years stuff i've forgotten. Also, just to ask a quick question in this thread for my next question so I don't have to post it here, in the formula v = f& (the & is actually a weird greek symbol), what does the & stand for?
  2. jcsd
  3. Feb 1, 2007 #2


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    Staff Emeritus
    Science Advisor

    T=1/f is correct, but f here stands for frequency. In your question, the wavelength is 660nm, not the frequency. First, you need to use the equation [itex]v=f\lambda[/itex] to calculate the frequency, then use the formula for time period. The "weird greek symbol" is the greek letter lambda and stands for wavelength.
  4. Feb 1, 2007 #3
    Thanks a lot for the help.
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