Final answer:
Signals over nerve channels can have different frequencies and are influenced by factors like relative motion between source and receiver. The cochlea differentiates frequencies by stimulating hair cells at various positions. Distinguishing between similar frequencies, such as 2002 Hz and 1999 Hz, is typically beyond the average person's hearing capabilities without simultaneous playback.
Step-by-step explanation:
Signals over nerve channels can indeed have different frequencies, and these signals are affected by several factors, including the relative motion between the source and the receiver. An example of signal frequency change due to relative motion is the Doppler effect, which, while commonly associated with sound and electromagnetic waves, can also apply to nerve signals in theory. The human ear's cochlea contains hair cells that vibrate due to pressure waves, stimulating nerves that create electrical signals with varying frequencies dependent on the position in the cochlea. High frequencies stimulate nerves closer to the start, and low frequencies affect nerves toward the end. The frequency and intensity of these signals are processed by the brain to provide additional information such as source direction. The hearing threshold for differentiating two close frequencies, such as 2002 Hz and 1999 Hz, is generally beyond the average person's capability without both frequencies being played simultaneously.
Moreover, there is mention of how wide the frequency of the channel might be, how strong the signal is, and whether the signal is continuous or intermittent, which are also important in considering the detectability and analysis of signals, such as those picked up by radio telescopes. These concepts tie in with both biological and physical properties of signal transmission.