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