Question

2 points
Q9. Ultrasonic sound
waves have frequency of
O 20 kilo Hertz
O 2 kilo Hertz
O More than 20 kilo Hertz
O Less than 20 kilo Hertz​

Answer 1

Answer:

more than 20kilo Hertz

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Answer 2

Answer:

20 kilo Hertz

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