Sonic Black Hole ·
A Horizon Made of Flowing Water
un
seel
.com · the gap speeds the water up · where it matches the ripples, sound can never swim back
Flow
0.20 m/s
Sound
0.70 m/s
Froude
0.28
State
SOUND CAN SWIM BACK
Flowing water (slow → fast)
Ripple wavefronts
The horizon — flow speed = ripple speed
Past it — everything swept downstream
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.com · Sonic Black Hole