Question

Which of these waves is ultrasonic and most useful in diagnostic sonography?

A) 400 MHz.
B) 4 MHz.
C) 2 kHz.
D) 200,000 Hz.

Answer 1

The most useful wave in diagnostic sonography is ultrasound with a frequency of 4 MHz.

Step-by-step explanation:

Ultrasound waves are frequencies above 20,000 Hz, which is higher than the highest audible frequency humans can hear. The frequency of option B, 4 MHz, falls within the ultrasound range. Ultrasound waves are most commonly used in diagnostic sonography for noninvasive medical diagnoses, such as observing a fetus in the womb.