What will happen when human could be able to listen 1 hertz or less then 1 hertz?

Answer 1

Technology does come to the rescue here.

Elephants for example give out vibrations far too low for humans to hear, but other distant elephants do hear the signal. (Similarly for some whales.)

You can record these arbitrarily low frequency signals, and then play them back with the recording speeded up. You will hear "speeded up versions " of the elephants talk. This method is not a "real time" technique, for it requires the signal to be replayed after it was recorded.

A "real time" method is to add the signal electronically to a carrier of say 5kHz.

You will hear the low frequency signal as a modulation of the 5kHz signal.

Our ears are very sensitive to 'Wow and Flutter' and the modulation of a signal of a few HZ will be heard.

Reverting to the question, what you make of the elephant talk is up to you and your understanding of elephant culture and sociology. I can't help there.

Answer 2

If humans could listen to sounds at 1 hertz or less, they would likely perceive these frequencies as extremely low rumbling vibrations rather than distinct pitches. It would potentially enable them to sense seismic activity or detect infrasound generated by natural phenomena like earthquakes or storms. However, the impact on human perception and communication would be minimal since speech and most environmental sounds occur at higher frequencies.