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The range of the visible spectrum is 400THz - 789THz.

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Q: What is the frequency range of spectrum?
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What is the Lowest frequency on a electromagnetic spectrum?

The lowest frequency is effectively zero and this would be in the extremely low frequency (ELF) band in the sub-radio range of the electromagnetic spectrum.


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What is the purpose of conducting a spectrum analysis?

In order to conduct a spectrum analysis one needs a spectrum analyzer. This device measure the magnitude of an input signal versus frequency within the full frequency range of instrument. The purpose of this is to measure the power of the spectrum of known and unknown signals.


What is sweep voltage?

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