How is ultrasound used to view an unborn baby?
In: Technology
It sends sound waves at a particular frequency — sound waves travel through objects, that’s why you can hear from a different room, etc. — and they bounce off things that have particular densities, so you can see what they hit.
Kind of like if you sprayed some liquid with harmless glow-in-the-dark stuff in it, at a doll, in a dark room. You couldn’t see the doll before you started spraying, but you’d see the doll when the liquid hit it, if that makes sense. It’s not exactly the same but
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