Assertion: optical signal | /r/CapableOf | propagate through free space
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text: For example, if x(t) represents the magnitude of the electric field component (in volts per meter) of an optical signal propagating through free space, then the dimensions of X(f) would become volt·seconds per meter and E s ( f ) {\displaystyle E_{s}(f)} would represent the signal's spectral energy density (in volts2·second2 per meter2) as a function of frequency f (in hertz).