What is the highest frequency of electromagnetic radiation?

  • #1
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Title says it all.

Also, if the frequency of electromagnetic radiation is limited, why? My guess is the wavelength is limited to the Planck length, and when I plug those numbers into the calculator, I get 1.855 * 10^43 Hz. The maximum (Edit: observed) frequency of a gamma ray is 3 * 10^20 Hz though.
 
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  • #2
PeterDonis
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Title says it all.
And here is the short answer: we don't know.

My guess is the wavelength is limited to the Planck length
This is a fairly common speculation in quantum gravity, but we don't have a confirmed theory of quantum gravity so we don't know if this speculation is correct.

The maximum frequency of a gamma ray is 3 * 10^20 Hz though.
You mean, the highest frequency of a gamma ray that we have observed is 3 * 10^20 Hz. That doesn't mean that's the highest frequency that is physically possible.
 
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  • #3
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And here is the short answer: we don't know.



This is a fairly common speculation in quantum gravity, but we don't have a confirmed theory of quantum gravity so we don't know if this speculation is correct.



You mean, the highest frequency of a gamma ray that we have observed is 3 * 10^20 Hz. That doesn't mean that's the highest frequency that is physically possible.
Yeah, I misstated the gamma ray part.

I don't understand, how is quantum gravity related to this?
 
  • #4
PeterDonis
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how is quantum gravity related to this?
It's related to your guess that the minimum wavelength for EM radiation is related to the Planck length, as I said in post #2.
 

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