this post was submitted on 29 Jun 2024
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[–] barsoap@lemm.ee 13 points 4 months ago (1 children)

Ackchyually... that's completely wrong. Frighteningly so, I might add, where has basic education gone.

Ultrasound are mechanical waves, light is EM radiation. Really slow light is infrared. Really fast ultrasound is... even more ultra ultrasound. Slower ultrasound would be this.

[–] SpaceNoodle@lemmy.world -4 points 4 months ago (1 children)