Eli5: what is ultrasound and what makes it “ultra”
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“Ultra” here is a prefix meaning “higher than” – ultrasound is a sound wave with a frequency too high for humans to hear.
This high frequency makes it highly reflective in a way that lower frequency audible sound is not, so it can be used for medical imaging because it will reflect off of the density changes between different tissues in your body.
Lower frequency sound waves just punch right through you. Very low bass will even go through brick walls, and you may have experienced from some bad neighbors or shitty subwoofers over the years.
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