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Homework Help: How to find the wavelength of a Photon with no mass?

  1. Apr 16, 2012 #1
    1. The problem statement, all variables and given/known data

    Hey guys, So I just did a problem here: (its find wavelength of particle with mass)

    But I need to figure out how to find the wavelength of a Photon with no mass.

    I know the formula I need is this: wavelength = c/f = hc/Energy

    BUT... What would be a general question that would ask this? What variable would be given, as in the problem I listed above trying to find the wavelength of a particle with mass, I was given the speed, so I could then plug into equation.

    What would I be given to ask to find the wavelength of a photo with no mass?

    Much thanks!

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Apr 16, 2012 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    As far as I can think at the moment, a problem might provide any of the following types of information and ask you to find the wavelength:
    • frequency
    • photon energy
    • photon momentum
    • frequency and refractive index, if the photon is not traveling in vacuum
    • frequency and speed, if the photon is not traveling in vacuum
    • details of a diffraction or interference experiment
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