The frequency of ultrasound wave is typically ---?
AAbove 20,000 kHz
BBelow 20 kHz
CAbove 20 kHz
DBelow 2 kHz
Answer:
C. Above 20 kHz
Read Explanation:
The frequency of an ultrasound wave is typically above 20 kHz (20,000 Hz).
Because human hearing is limited to an audible range between 20 Hz and 20,000 Hz, any sound wave with a frequency exceeding this upper threshold is classified as ultrasound.
## Typical Applications and Specific Ranges:
* General Definition: Above 20 kHz.
* Industrial Applications: Typically ranges between 20 kHz to 200 kHz (used for tasks like cleaning and welding).
* Medical Diagnostic Imaging (Sonography): Typically ranges much higher, between 2 MHz to 18–20 MHz (Megahertz, or millions of hertz) to capture fine details inside the body.