What term describes sound waves with a frequency lower than the typical lower limit of human hearing, generally below about 20 hertz?

Explanation

Infrasound refers to sound waves with a frequency lower than approximately 20 hertz, the generally accepted lower limit of typical human hearing, meaning these very low-frequency sound waves exist but typically cannot be consciously heard by people. Certain animals, such as elephants and some large whale species, are able to produce and detect infrasound, using it for long-distance communication that can travel remarkably far compared to higher-frequency sounds. Natural events like earthquakes and volcanic eruptions can also generate significant infrasound, which scientists sometimes monitor for research and early warning purposes. Explore more Everyday Science MCQs on mcqstutor to keep practicing.