Question

The speed of highly penetrating ultrasonic waves is

Answer 1

Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz. The term sonic is applied to ultrasound waves of very high amplitudes. Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 10 raised to the power 13 hertz. At such high frequencies it is very difficult for a sound wave to propagate efficiently; indeed, above a frequency of about 1.25 × 10 raised to the power 13 hertz it is impossible for longitudinal waves to propagate at all, even in a liquid or a solid, because the molecules of the material in which the waves are traveling cannot pass the vibration along rapidly enough.

Answer 2

Ultrasonic waves

Explanation:

• Ultrasonic waves are the waves having frequency greater than upper audible limit of human hearing i.e. 20 Hz to 20,000 Hz. Sound at frequencies greater than 20 kHz
• The ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.
• The applications of ultrasonic waves are ultrasound imaging or sonography in medicinal processes.

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Ultrasonic waves

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