Which of the following statements is true about the use of ultrasound in medicine? a. Ultrasound treatments can cause the breakup of small deposits such as kidney stones and gallstones b. Ultrasound waves have very low frequencies- to low to be heard by the human ear. c. Ultrasound energy is absorbed by soft tissues such as the pancreas, kidneys, and gallbladder, and does not produce good images of those types of tissues.

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