What is the frequency of radiation that has a wavelength of 0.952 µm?

What's the longest possible wavelength/lowest possible frequency/lowest possible energy of electromagnetic radiation?

  • I know about http://en.wikipedia.org/wiki/Extremely_low_frequency - but I'm sure even longer wavelengths exist. What is the lowest frequency of radiation that has been ever measured? I'm sure it's lower than 3 Hz.

  • Answer:

    It depends.  On the long end, the answer appears to be about equal to the size of the universe.  On the low end, tho, it depends on what is meant.  Once you have a large enough photon energy, it can start producing electron-positron pairs as it goes.  That would suggest that the largest energy that is stable as an electromagnetic wave in a vacuum is about 1 MeV, or a wavelength of 0.01 Angstrom.  Such a wave will travel a long distance, but eventually will succumb to pair production.

Brian Dodson at Quora Visit the source

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Other answers

You are right, the VLF radio stations operate down to 3Hz but much lower frequencies are possible down to 1 milliHertz http://en.wikipedia.org/wiki/Ultra-low_frequency these are related to events in the magnetosphere the exact mechanism is unknown. The answer by gives details for the shortest wavelengths.

Malcolm Sargeant

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