Final answer:
White noise is a type of noise with equal power at all frequencies and cannot physically exist across all frequencies due to energy constraints.
Explanation:
White noise is a type of noise characterized by having a flat power spectral density, meaning it contains equal power at all frequencies, and is often approximated by a constant spectral density. White noise is considered to consist of a random mixture of all possible sinusoidal components with equal weights, similar to the spectral composition of natural white light. Contrary to its name, pure white noise that spans all frequencies cannot physically exist due to the infinite energy it would require.
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