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Homework Help: Frequency of Xrays

  1. Jul 15, 2011 #1
    1. The problem statement, all variables and given/known data
    X-rays are electromagnetic waves with very short wavelengths. Suppose an X-ray has an wavelength of 0.126 nm. What is its frequency?

    3. The attempt at a solution
    I tried (1)/(1.26E-10)=7936507937, which is in Hz, but they want it to GHz, so i converted it and got 7.94 GHz but it's incorrect? Any idea where i'm going wrong?
  2. jcsd
  3. Jul 15, 2011 #2

    Chi Meson

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    Science Advisor
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    Wavelength is not the inverse of frequency.

    wavelength x frequency = speed
  4. Jul 15, 2011 #3
    So what is the speed? Is it the constant c, 3E8? And will using that give me my answer in Hz?
  5. Jul 15, 2011 #4
    yes its c, all EM radiations have speed c
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