The Speed Of Light Captured

YouTuber AlphaPhoenix recorded the speed of light with a 2 billion FPS camera in his garage.

Notice the amount of time it takes. There are a lot of zeroes to the right of that decimal point.

20 thoughts on “The Speed Of Light Captured

    • The speed of light will slow down depending on the medium (other than a vacuum) through which it travels.
      This slowing down is described by the medium’s refractive index (n):
      v = c / n
      where:
      v = speed of light in the medium
      c = speed of light in vacuum
      n = refractive index of the medium (always ≥ 1 for real materials)

  1. I believe that the verdict is still out, however quantum entanglement and “spooky action at a distance” may challenge the universes maximum speed limit.

    • It looks like there is a different set of rules for the “speed of light” in the quantum world.

  2. 58.5 picoseconds is pretty dang fast.
    In vacuum? Slower in air or other mediums. The photons interact with the medium.

    • P.S. – I used this “bounce between mirrors” trick to measure (as best as I could) the speed of light using a pumped-ruby laser bouncing between two mirrors in my HS gymnasium. Measured it to about 150,000 miles/sec. Not bad!
      Primitive equipment, slow ‘scope, many tries. Honors Physics class in HS, all my idea and we ran with it. FUN!
      Remember, I’m a NERD. Always have been.

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