Question

Infrasound (or infrasonic):

A) Refers to high-frequency waves.
B) Is sound with frequencies below the audible range.
C) Is used in diagnostic sonography.
D) Is synonymous with ultrasound.

Answer 1

Ultrasound is sound with frequencies above the audible range. It is used in noninvasive medical diagnoses such as observing a fetus in the womb.

Step-by-step explanation:

Ultrasound refers to sound with frequencies above the highest audible range. It is sound with a frequency higher than 20,000 Hz (or 20 kHz), which is beyond the range of human hearing. Ultrasound is commonly used in noninvasive medical diagnoses like observing a fetus in the womb.