📝 Multiple Choice Question
General-science
Which of the following is a property of ultrasonic waves?
A
they can be heard by humans
B
they have frequency less than 20 hz
C
they can be used for cleaning small parts of machinery
D
they travel slower than ordinary sound
Explanation
Ultrasonic waves (>20 kHz) create cavitation in liquids, which effectively removes dirt from complex mechanical components.
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