Radiology The ultrasonic sound waves employed in ultrasound machine for medical sonography have the frequency of – A 2 – 20 MHz B Less than 1 MHz C 20 – 20, 000 Hz D Greater than 100 MHz 💡 Explanation The ultrasonic sound waves employed in ultrasound machine for medical sonography have the frequency of - ✓ Correct Answer: A. 2 – 20 MHz