A. frequency in the audible range
B. frequency is greater than 20 kHz
C. frequency lower than 20 Hz
D. all of above
Correct Answer: frequency is greater than 20 kHz ✔
Last Updated: February 11, 2021
A. frequency in the audible range
B. frequency is greater than 20 kHz
C. frequency lower than 20 Hz
D. all of above
Correct Answer: frequency is greater than 20 kHz ✔
Last Updated: February 11, 2021