The frequency of the waves used in ultrasonography is:
A. 20 Hz
B. Below 20 Hz
C. 20 Hz to 20000 Hz
D. Above 20000 Hz
Answer:B
The frequency of the waves used in ultrasonography is:
A. 20 Hz B. Below 20 Hz C. 20 Hz to 20000 Hz D. Above 20000 Hz