Applied Physics I: Chapter 5: Oscillations and Waves - Ultrasonics
Ultrasonics and its Properties
The sound wave having frequency more than 20000 Hz are called as ultrasonics or ultra sound.
ULTRASONICS
AND ITS PROPERTIES
The
sound wave having frequency more than 20000 Hz are called as ultrasonics or
ultra sound.
For
example, bats use ultrasonics for its navigation and communication.
Both
infrasonics and ultrasonics are inaudible to human ear.
Properties
•
Ultrasonic waves vibrate at a frequency greater than the audible range for
humans (20000 Hertz).
•
They have smaller wavelengths. As a result, their penetrating power is high.
•
They cannot travel through vacuum.
•
Ultrasonic waves travel at the speed of sound in the medium. They have maximum
velocity in a denser medium.
•
In a homogeneous medium, they travel at a constant velocity.
•
In low viscosity liquids, ultrasonic waves produce vibrations.
•
They undergo reflection, refraction and absorption.
•
They have high energy content. They can be transmitted over a large distance
without much loss of energy.
•
They produce intense heat when they are passed through objects.
•
Like sound waves, ultrasonic waves are longitudinal waves that produce
alternate compressions and rarefactions.
Applied Physics I: Chapter 5: Oscillations and Waves - Ultrasonics : Tag: Applied Physics : - Ultrasonics and its Properties
Applied Physics I: Chapter 5: Oscillations and Waves - Ultrasonics
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