properties of ultrasonics
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The ultrasonic waves cannot travel through vacuum.
These waves travel with speed of sound in a given medium.
Their velocity remains constant in homogeneous media.
These waves can weld certain plastics, metals etc.
These can produce vibrations in low viscosity liquids.
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the sound waves which we can hear with our ears and are specially used by the bats to communicate each other and it is used in many more things like x Ray's machine , to remove the dirt from machine etc.
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