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Infrasound and Ultrasound.

What is Infrasound?

Sound with a frequency lower than 20 Hz is called infrasound.
These very low frequency sound waves
can be given off by volcanoes and meterorite explosions.
Infrasound is used by some large animals for communication.
Whales can communicate over hundreds of miles using infrasound.

What is Ultrasound?

Sound with a frequency higher than 20,000 Hz is called ultrasound.

Ultrasound echoes are used in
Scanning and Range and Direction Finding.

Ultrasound in liquids can be used to clean precious or
delicate items because the compressions and rarefactions
of the ultrasound will shake dirt and unwanted material free
without the risk of damage being caused by handling the item.

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