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There are no limits to the E&M spectrum.

At the upper end, gamma rays extend to frequencies so high that their wavelengths are
shorter than an atomic nucleus. Higher-energy sources in the universe produce gamma
rays with higher frequency, and there's no theoretical limit.

At the lower end, the power grid radiates plenty of electromagnetic energy at 60 Hz, and
it's relatively easy to build an oscillator on your work bench, if you want to, with a frequency
of 1 cycle per month or lower. Again, there's no theoretical limit.


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10y ago

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