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    Wikipedia def:
    Bandwidth is the difference between the upper and lower frequencies in a continuous set of frequencies.

    Does he mean continuous as in [0,4] where every single frequency between 0 and 4Hz exists? That is: the signal is the sum of an infinite number of waves each with an infinitesimally small difference in frequency between 0Hz and 4Hz?
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    ugh sorry, stupid Q - obvious it's a range and not continuous. White light is 7 distinct colors and the difference would be the BW
 
 
 
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