What are Ultrasonic Waves?

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Debraj Paul

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Ultrasound is acoustic (sound) energy in the form of waves having a frequency above the human hearing range. The highest frequency that the human ear can detect is approximately 20 thousand cycles per second (20,000 Hz). This is where the sonic range ends, and where the ultrasonic range begins.
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Math-e-Magician

These are the waves having frequencies (Vibrations/oscillations of particles) above those of audible sound waves-greater than about 20 kHz. Many animals have the ability to hear sounds in the human ultrasonic frequency range. A presumed sensitivity of roaches and rodents to frequencies in the 40 kilohertz...
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These are the waves having frequencies (Vibrations/oscillations of particles) above those of audible sound waves-greater than about 20 kHz. Many animals have the ability to hear sounds in the human ultrasonic frequency range. A presumed sensitivity of roaches and rodents to frequencies in the 40 kilohertz region has led to the manufacture of “pest controllers” that emit loud sounds in that frequency range to drive the pests away. read less
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Tutor with 15 years of teaching experience

Vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz.
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