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What is the highest possible frequency that a photon can have?

Here is an answer from Answers.com. Is this correct?

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Here is an answer from Answers.com. Is this correct?

That's a good question and I've often wondered about it. I think, but I'm not certain, that the answer is the reciprocal of the Planck time, which is 10^43 Hz. At shorter wavelengths than 10^-35 m., which is the wavelength that corresponds to this frequency, the photon would disappear in the quantum foam. A photon with this frequency would have an energy of 10^43 times Planck's constant, 6.67x10^-34 joule-secs. This energy is 6.7x10^9 joules which is nearly 2000 kilowatt hours. Its mass equivalent would be 6.7 x 10^-9/ c^2, which is 8 x 10^-5 gram. Most of the maximum possible quantities are obtained by juggling the fundamental constants of physics; the speed of light c, Newton's universal gravitational constant G, Planck's constant h etc. until you get a quantity with the right dimensions, then work it out numerically with your calculator. For instance if you take the square root of (Gh/(c^3)) you get a quantity with the dimensions of length, which turns out to be the Planck distance, which is the wavelength of this photon; about 10^-35 metre.

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