What are 400hz, 600hz, and 800hz increments of?

The correct answer is related to octave band widths, as the specified increments of 400 Hz, 600 Hz, and 800 Hz suggest a measurement related to audio frequencies in a specific range.

Octave band widths are used in acoustics and sound engineering to represent frequencies in divisions where each octave is a doubling of frequency. For example, if you consider a 400 Hz increment, it represents a frequency band that potentially covers a range around a central frequency, simplifying the analysis of how sound is perceived and processed.

In this context, each increment could signify how sound frequencies are spaced in a way that relates to human hearing and its perception of sound quality. This spacing is critical in various applications, like determining the impact of different sound frequencies on hearing aids or sound systems.

The other options do not align correctly with the increments provided. Fundamental frequency refers to the lowest frequency of a periodic waveform and is not associated with increments such as those listed. Harmonics are derived from the fundamental frequency, representing higher frequencies that are multiples of the fundamental, but do not use the specific increments mentioned. Octave frequencies would denote specific frequencies based on a doubling pattern not represented by the 400 Hz, 600 Hz, and 800 Hz increments in this case.