by Harry Dalek » Fri Jan 22, 2021 7:27 pm
The Spokesman-Review (Spokane, Washington)25 May 1969, Sun
The World (Coos Bay, Oregon)26 May 1969, Mon
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The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.