This invention generates high-frequency sounds in the high-pitched range of human hearing, composed of sound waves between 15,000 and 20,000 cycles per second, which can annoy younger people but ...

Humans perceive amplitude as loudness, so if the sound is really loud, the waveform will show tall crests. These crests indicate the amplitude. If the sound has a high pitch, the waves will appear ...

For example, if a high-pitched sound travels 213 feet on Earth, it will travel just 26 feet on Mars. While sounds on Mars can be heard by human ears, they are incredibly soft.

Anything above 240 hertz is considered a high-pitched noise, whereas anything below 240 hertz is low-pitched. ... which means it's more difficult for acoustic waves to project very far.

Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound ...