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sounds
In physics, sound is a vibration that propagates as an acoustic wave through a transmission medium such as a gas, liquid or solid.
In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Only acoustic waves that have frequencies lying between about 20 Hz and 20 kHz, the audio frequency range, elicit an auditory percept in humans. In air at atmospheric pressure, these represent sound waves with wavelengths of 17 meters (56 ft) to 1.7 centimeters (0.67 in). Sound waves above 20 kHz are known as ultrasound and are not audible to humans. Sound waves below 20 Hz are known as infrasound. Different animal species have varying hearing ranges, allowing some to even hear ultrasounds.
Hello everyone! 1st post since just getting the father in-laws 78 cj 7 renegade, so please bear with me. It has a issue with the t-case that gets bound up when trying to get it out of 4 hi/lo. it has a noise that sounds like 2 gears are rubbing together. Just kinda like barely trying to...