Ultrasonics are sound waves of frequency

1.
Ultrasonics are sound waves of frequency

A. greater than 20,000 Hz

B. less than 10,000 Hz

C. equal to 1000 Hz

D. None of these

Answer» B. less than 10,000 Hz

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1.	Ultrasonics are sound waves of frequency
A.	greater than 20,000 Hz
B.	less than 10,000 Hz
C.	equal to 1000 Hz
D.	None of these
Answer» B. less than 10,000 Hz

Ultrasonics are sound waves of frequency

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