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Homework Help: Frequence of red light in air

  1. Jan 25, 2006 #1
    If the wavelength of red light in air is 816 nm, What is it's frequency? If I use the equation F=c/wavelegth -> with c being 3 x 10^8m/s, why can't I get the right answer? I even converted the 816 nm to 8.16 x 10 ^ 11 m. :confused:
    Last edited: Jan 25, 2006
  2. jcsd
  3. Jan 25, 2006 #2


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    Science Advisor
    Gold Member

    You need to be more careful with your units:

    816 nm = 816 * 10^(-9) m = 8.16 * 10^(-7) m
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