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Medical Physica Ultrasound Essay Preview: Medical Physica Ultrasound Report this essay Medical Physics. Ultrasound Sounds, including ultrasounds, are mechanical longitudinal waves, meaning they are created by vibrations in a medium. Hearing range is ~20 Hz to 20 000 Hz. Sounds with a frequency greater than 20 000 Hz are ultrasounds. Diagnostic ultrasound, however, uses frequencies.