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How long do you think it would take for YOU PERSONALLY (you cannot be told or informed by any other person) that light has begun to move at the speed of sound (So, everything else remains the same, but things farther away will be delayed visually. You also see things at the same rate that you hear them, so a firework 10 miles in the distance would have the visual explosion and the sound at the exact same time)

Oh, and, this is ONLY a visual effect. The internet slowing to a crawl because suddenly light is lagging would make it too obvious.

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  • 2
    It would probably take me a few weeks. Why? Well, that's just about how often I use a flashlight on something thats kinda far away (typical flashlight use is from my phone on nearby objects)

    I'm talking the tops of trees, the end of the street, whatever. Outdoor flashlight use.

    I feel like I would notice the lag of the beam on very far targets. It would be extremely subtle, but it would be there. Like switching from 60 to 120 FPS on a game. Otherwise, how would I even know?!
  • 0
    Well, what would cause the medium for light to change in a uniform way? Light through air travels at a different speed than light in a vacuum, or through water.

    I have experienced sound traveling at a lower speed in fog before. It probably is why fog is eerie. The rules change.
  • 4
    I would start to get suspicious when i see that cars passing by have weird colours because they are getting blueshifted/redshifted.

    Related: https://devrant.com/rants/2419374/...
  • 2
    Interesting thought.
    @cafecortado is right, if the speed of light would be as slow as the speed of sound, it would cause a doppler effect on the same level as sound does. And you would notice it pretty fast.
    If we ignore that, I think it would also take me at least a few days to notice.
  • 0
    There would be no internet / it would be very slow
  • 1
    Binding energies would change, so chemistry would stop working, and the concept of noticing things would cease to apply.
  • 1
    @antigermanist read the goddamn original rant! 😅
  • 2
    @badger I interpret it as just light/photons becoming slow, not the speed of causality. So chemistry and physics would mostly remain the same, especially on the micro scale.
  • 2
    @badger ah damnit, I just realized that electromagnetism IS light 😂
    So you are right, we would probably not notice it at all because we would stop existing.
  • 3
    @Lensflare @badger yeah the physics of it all makes this question terribly un-fun. That's why I specified it's a visual-only glitch: the world still works, so the only thing left to do is notice
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