The first person to produce ultrasonic waves by whistling was Galton. Sir Francis Galton, a polymath and cousin of Charles Darwin, discovered ultrasonic waves in 1883 through his experiments with high-pitched whistles. His work laid the foundation for understanding and ...
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Ultrasonic waves cannot be heard by humans. They have frequencies higher than 20,000 Hz, beyond the range of human hearing. While some animals can detect ultrasonic frequencies, humans cannot perceive these waves audibly without the aid of specialized equipment.
Ultrasonic waves have frequencies more than 20,000 Hz, beyond the upper limit of human hearing. They are used in various applications such as medical imaging, industrial cleaning, and sonar.