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

AI Thread Summary
To find the wavelength of a photon, the relevant formulas include wavelength = c/f and wavelength = hc/Energy. A general question could provide variables such as frequency, photon energy, or momentum to determine the wavelength. Additionally, scenarios involving the refractive index or details from diffraction and interference experiments could also be used. Understanding these variables is essential for solving problems related to massless photons. This approach helps clarify how to frame questions about photon wavelengths in physics.
nukeman
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Homework Statement



Hey guys, So I just did a problem here: (its find wavelength of particle with mass)
https://www.physicsforums.com/showthread.php?t=596936

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!





Homework Equations





The Attempt at a Solution

 
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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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