How is impulse noise typically represented on a spectrum analyzer?

Impulse noise is typically characterized by its sudden bursts of energy, which cause irregular and brief peaks in the signal. On a spectrum analyzer, this type of noise is represented as random spikes of energy across the frequency spectrum. These spikes appear erratically and do not follow a regular pattern, which accurately reflects the unpredictable nature of impulse noise.

Unlike continuous waveforms, which appear as smooth lines or consistent shapes, the representation of impulse noise highlights how it can occur at various frequencies without a defined structure. This makes option B the most accurate choice, as it effectively captures the essence of impulse noise being sporadic and irregular in its manifestation across the spectrum.

Other options suggest more orderly or predictable characteristics, which do not apply to the nature of impulse noise. For instance, a continuous wave would imply a steady state rather than random occurrences. Similarly, a steady increase in amplitude or a series of periodic waves would imply consistency and predictability, which are not traits associated with the unpredictable and transient nature of impulse noise.