Biology, 17.10.2019 02:00 maddy3lizabeth

Which best describes the process by which ultrasounds images are made?
low-frequency sound waves are generated by a machine and refracted off of objects, creating echoes that are processed into images.

high-frequency sound waves are generated by a machine and refracted off of objects, creating echoes that are processed into images.

high-frequency sound waves are generated by a machine and reflected off of objects, creating echoes that are processed into images.

low-frequency sound waves are generated by a machine and reflected off of objects, creating echoes that are processed into images.

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Which best describes the process by which ultrasounds images are made?
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