# Hypothetical maximum energy of a single photon [duplicate]

I'm no physicist so it might be a stupid question but is there a maximum energy a single photon can have?

My idea was, that there might be restriction for the minimum wavelength and I thought about the Planck length: $$1.616 · 10^{−35}$$ m

So my hypothetical photons energy would be:

$$E=hf=\frac{hc}{\lambda}$$

So I put the values inside: $$E=\frac{6.62607015 \cdot 10^{−34}\cdot 299792458}{1.616 \cdot 10^{−35}} \frac{\text {J s m}}{\text{s m}}$$

which gives me the value: $$1.23*10^{10}$$ J

Is this the maximum amount of energy that a single photon can have, or is the concept of using the planck length as minimal possible wavelength not correct?

And are photons with that much energy even existing in the universe?

• – PM 2Ring Apr 1 at 18:45
• The question linked to as a dupe has several answers, but the one that I think is the right answer is in the bottom, with only three votes: I don't see any reason there should be a maximum energy. Send me a photon of arbitrarily high energy, and I can increase its energy further in my reference frame (which is just as valid as any) by moving toward your source. – pela Apr 1 at 21:24