Ultrasound (Application of Ultrasound) - Sound | Class 9 Physics

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✅ In this video,

✔️ Class: 9
✔️ Subject: Physics
✔️ Chapter: Sound
✔️ Topic Name: Ultrasound (Application of Ultrasound)
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00:00 Introduction
00:09 Ultrasound
17:00 Application of Ultrasound
25:00 Website Overview
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Points covered in this video:-

Ultrasound
The sounds having too high frequency which cannot be heard by human beings are called ultrasonic sound or ultrasound.
In other words, the sounds having frequency greater than 20,000 hertz are called ultrasound.
For example, a sound of frequency 100,000 hertz is an ultrasound.
The ultrasound is reflected just like ordinary sound waves and produced echoes.
But the echoes produced by ultrasound cannot be heard by our ears, they can only be deducted by special equipment.
Due to its very high frequency, ultrasound has a much greater penetrating power than ordinary sound.
It can be used to detect objects under the sea, and organs inside the human body.

Application of Ultrasound
Ultrasound is used in industry for detecting flaws (cracks, etc.) in metal blocks without damaging them.
The flaws like internal cracks, etc. in the metal blocks are detected by using ultrasound.
This is based on the fact that an internal crack (or holes, etc.) does not allow ultrasound to pass through it.
It reflects ultrasound.
Ultrasound is used to investigate the internal organs of the human body such as liver, gallbladder, pancreas, kidneys, uterus and heart etc.
Ultrasound scans are used to monitor the development of fetus (unborn baby) inside the mother’s uterus.
Ultrasound is used to break kidney stones into fine grains (which then get flushed out with urine).
Ultrasound is used in ‘sonar’ apparatus to measure the depth of sea (or ocean); and to locate under-sea objects like shoal of fish, shipwrecks, submarines, sea-rocks and hidden icebergs in the sea. .

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