A. 1/4f
B. 1/2f
C. frequency lower than 20 Hz
D. 2f
Correct Answer: frequency lower than 20 Hz ✔
Last Updated: February 11, 2021
A. 1/4f
B. 1/2f
C. frequency lower than 20 Hz
D. 2f
Correct Answer: frequency lower than 20 Hz ✔
Last Updated: February 11, 2021