Re: upper/lower *theoretical* limits for photon wavelength

In message <1117427010.777559.120660@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
ensabah6@xxxxxxxxx writes
>i am wondering whether 1- there is a lower limit for short photon
>wavelength, or what would happen to the photon as it continually gets
>more energetic. will it sponatenously become a electron-positron pair?

Conservation of energy-momentum means that a "real" (mass=0) photon
can't. Of course it can be absorbed by a charged particle and that can
lead to particle creation.


>
>also, i wonder if thereis an upper limit for long wavelength photons.
>it's my understanding radio waves can have wavelengths in kilometers.
>is there a minimum energy a photon must have, or could it have a very
>very low energy approaching zero?
>
There is no bound on the number of photons at ever lower energies, a
fact which used to cause "the infrared catastrophe" until it was
understood.


Regards

--
Charles Francis

.

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