Infra sound and ultra sound – ഇൻഫ്രാ സൗണ്ട്, അൾട്രാ സൗണ്ട്
Infra sound is sound that is lower than the human hearing range (below 20Hz). It is usually felt as a vibration, due to its low frequency. It can be produced by natural events such as volcanic eruptions, earthquakes, and avalanches, as well as man-made sources such as industrial machinery and explosions. Ultra sound is sound …
Infra sound and ultra sound – ഇൻഫ്രാ സൗണ്ട്, അൾട്രാ സൗണ്ട് Read More »