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Ultrasonic waves are those sound waves having frequency __________? | Ace MCQs
ND
Nadeem Dar
5 years ago
General Knowledge
Ultrasonic waves are those sound waves having frequency __________?
A
between 20 hertz and 1000 hertz
B
between 1000 hertz and 20000 he
C
less than 20 hertz
D
more than 20 kilohertz
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