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What is the ultrasonic sound?...

What is the ultrasonic sound?

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**Step-by-Step Solution:** 1. **Understanding Sound Frequencies**: Sound can be categorized based on its frequency, which is measured in Hertz (Hz). The human ear can typically hear sounds in the frequency range of 20 Hz to 20,000 Hz. 2. **Defining Infrasonic Sound**: Sounds that have frequencies lower than 20 Hz are called infrasonic sounds. These sounds are not audible to humans. 3. **Defining Ultrasonic Sound**: Conversely, sounds that have frequencies higher than 20,000 Hz are termed ultrasonic sounds. These sounds are also not audible to humans. ...
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