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I don't know the principle of operation, but years ago in "Popular Electronics" magazine, there was a construction article for a device that would allow you to hear super-sonic sounds like dog whistles, the sounds that insects make, etc. I think it mixed and shifted frequencies kinda like a super-heterodyne radio receiver does with RF. Like you, I'd like to have such a device. On the other hand, if a device picked up sub-sonic sounds, it would probably just pick up those "boom trucks" that all the young people drive, and in my opinion we can already hear those things from far enough away (about a mile). Supporting ideaIndustry uses this equipment. A link is provided, but only as an example of the stuff being considered. No opinion, pro or con, is stated or implied. It's just a window to look through. Note: the stuff is kinda pricey for non-professional acquisition. Hit the www and see what else is out there.
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your ears pick up vibrations called sound waves in the air and we inperpret these as 'sounds'
The average human ear can discern tones down to about 20Hz (cycles per second). The lowest that humans can normally hear is in the 20 Hertz range (20 cycles/sec). 20HZ
Your ears enable you to hear. You need ears and a brain.
Ears have an important job. They can hear dogs barking, friends whispering, or teachers talking. They hear all kinds of things. All sounds are made by vibration. The back and… forth motion spreads out in waves. These waves travel trough the air or a piece of matter until it reaches the ear. The outer part of the ear works as a funnel. It directs the sound into the ear.
Ultrasonic. The opposite would be infrasonic.
Corn. why do you say corn?
a little elf walks down your ear and listens and then tells your brain .
Rephrase the question please Van Stevens email@example.com
theres a ear drum thet smacks differint sounds into your ear and your brain has to funtoin in fast
the membrane of the tympanum or ear-drum.
Anything that satisfies the first criterion, idiot. In case you meant "can't", corn (maize).
surgically implant a tiny magnet in the inner ear. By attaching a magnet to the round window, they open a second pathway to the inner ear. An electromagnetic coil implanted in… bone behind the ear vibrates the implanted magnet
they do this because their ears or sensitive to the sound and they are then ready and alert for any another sounds that may follow