ARDMS Ultrasound Physics & Instrumentation Practice Exam

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Which frequency is considered ultrasonic?

10 kHz
1 MHz
500 kHz
100 Hz

The correct answer is: 1 MHz

Ultrasonic frequencies refer to sound waves that are above the audible range for humans, which is typically between 20 Hz and 20 kHz. Therefore, any frequency greater than 20 kHz can be classified as ultrasonic. 1 MHz (or 1,000,000 Hz) falls well within this ultrasonic range, as it is significantly higher than 20 kHz. This characteristic makes it ideal for medical ultrasound imaging because it provides the high-frequency sound waves necessary for obtaining detailed images of structures within the body. In contrast, other options such as 10 kHz, 500 kHz, and 100 Hz do not qualify as ultrasonic because they fall at or below the 20 kHz threshold, particularly the 100 Hz option which is far below this range. The 10 kHz and 500 kHz options also do not reach the significant threshold where ultrasonic applications are utilized effectively for imaging or therapeutic purposes.