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What are ultrasonic sounds? Write some applications of ultrasonic waves.

Ultrasonic waves are sound waves of frequency greater than the human audible frequency. Ultrasound refers to the sound with frequency higher than 20 kHz. Ultrasound is commonly used for the ultrasound scanning purpose.

 

Ultrasound finds its uses in many fields, some of them are:

(1) Fluid Science - Measuring fluid flows.

(2)Material Science - To measure material thickness of various types

(3) Dental Science - Treating and cleansing of teeth

(4) Surgery - Removal of fatty tissues, liposuction

(5) Chemistry - Producing consumable alcohol, ethanol.

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Hi!

Sound waves whose frequency is above the audible range of the humans is called as ultrasound.

Ultrasound is used to visualize the foetus inside a mother and studies indicate that it can have some harmful effects on the foetus.

Ultrasound finds its uses in many fields, some of them are:

(1) Fluid Science - Measuring fluid flows.

(2)Material Science - To measure material thickness of various types

(3) Dental Science - Treating and cleansing of teeth

(4) Surgery - Removal of fatty tissues, liposuction

(5) Chemistry - Producing consumable alcohol, ethanol.

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 Ultrasonic Waves in Media 
It is known that frequency range of sound audible to humans is approximately 20 to 20,000 Hz (cycles per second). Ultrasound is simply sound 
that are above the frequency range of human hearing

i) Sonar:

It is low-frequency ultrasonic beam used for underwater observation, communication and navigation in the study of oceanography. The sonar can penetrate deep into the ocean and be reflected back from an obstacle there; thus giving detail underwater information's. The bottom of the ocean can be mapped properly by using an echo-sounder. The locations and proper positioning of enemy vessels can also be detected using military sonar's.

(ii) Industry:

In industry ultrasonic waves are widely employed for quality control testing. When a short pulse of ultrasound is sent into a metal, it is immediately reflected back from cracks and blow nous if any present. Along with light, sound wave is used in acoustic holography for advanced technological implications.

(iii) Medicine:

For diagnosis of diseases and getting knowledge about internal organs 'ultrasonography' is used widely in medical science at present time. This technique is mostly employed to locate and define brain tumors, to locate the position of placenta and" fetus during pregnancy, to detect stones in gall bladder and kidneys and to identify the site and severity of arterial obstruction. The instrument used for these purposes is "ultrasonoscope."

 
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