Question

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

Explanation:

20 kHz

20 kHzUltrasonic wave is defined as “inaudible sound with high frequency for human” the frequency of which generally exceeds 20 kHz. These days, sound wave which is not intended to be heard is also called ultrasonic wave.