Discussion
White noise is so called because its power spectral density is
Answer: B
White noise has a flat power spectral density, by analogy with white light containing all colours equally, and its autocorrelation is therefore an impulse: samples taken at any two distinct instants are uncorrelated. A single frequency is a tone. A density proportional to frequency is sometimes called blue noise, and an inverse dependence is pink or flicker noise, which is what semiconductor devices show at low frequency. Truly flat noise over infinite bandwidth would carry infinite power, so the flatness is always stated over a band.
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