It is said that the human ear can normally only hear sounds between 30 hertz and 20 kilohertz.
Sound waves with wavelengths lower than 30 Hz and higher than 20 kHz, which cannot be heard by the human ear, are called ultrasonic waves.
By generating ultrasonic waves and measuring the wavelength returned by their reflection, it is possible to determine the distance to an object, its shape, and even its condition.
Dolphins use ultrasonic waves to communicate with other dolphins, and bats can also detect and catch prey by reflecting ultrasonic waves.
Ultrasonic waves are also used in various fields today because of the strong sound pressure and power of their low-wave action, or high-pitched sound.
Ultrasonic vibrations are also used in washing machines to generate friction and stress-generated heat, which can also be used to fasten objects together.
It is also used in scalpels, for example, where ultrasonic vibrations applied to the blade reduce friction with the cutting surface.
Today, ultrasonic waves are used in a variety of fields, but it is said that an incident in 1912 triggered their industrialization.
In 1912, the Titanic struck the tip of an iceberg and sank. Thinking that the incident could have been prevented if there had been a machine that could detect objects in the vicinity underwater where humans cannot see them, the development of ultrasonic sonar, a machine that could detect objects by the reflection of sound, and the subsequent development of ultrasonic research began.
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