By definition, ultrasound is sound having a frequency greater than _____ cycles per second, that is, sound above the audible range.
A. 10,000
B. 20,000
C. 30,000
D. 40,000
Answer:B
By definition, ultrasound is sound having a frequency greater than _____ cycles per second, that is, sound above the audible range.
A. 10,000 B. 20,000 C. 30,000 D. 40,000