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Time Warp

 
    Forums    Time Warp    TW: Show Ideas: Miscellaneous    The end of a laser beam

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I've been trying to wrap my head around this for a while. I'm not sure about the relativity or particle physics involved so I have no idea if or how this would even work, but it is interesting to me.

Consider the speed of light, exactly 299,792,458m/s (in a vacuum). We'll call it 300 million meters per second just for simplification. Now suppose you had a huge area. Like, 300 meters across. Over 3 football fields. And suppose it was enclosed and filled with smoke. Now, imagine a laser pointer at one end aimed directly at the other end. Suppose the laser fired. It should travel the 300m distance in 1/1,000,000 of a second, right? Now, what if there were a camera watching the whole thing, and it had a resolution of at least 1,000,000 frames per second. From what I know, the current fastest camera offers 200 million frames per second, so 1 million should be no problem for Time Warp's resources.

If the laser is traveling the distance in 1/1,000,000 of a second, and the camera can capture over 1,000,000 frames per second then, (assuming the laser turned on right in-between frames) in one frame, the beam should be halfway between the start and the end. That is, in one frame, the beam should be about 150m long and stopping midway in the 300m stadium, or whatever it is. This is really fascinating to me for whatever reason. We're so used to seeing linear, unbroken laser beams. Is it actually possible to see a laser beam stop in mid-air like this? Again, I've tried thinking about the relativity involved but I can't wrap my head around it.

And, hell, if the cameras had an even higher framerate, then maybe you could see multiple frames, with each frame showing the laser beam advancing a little bit more. Though, something to consider is that I'm imagining this camera seeing a huge distance, 300m from some vantage point. I have no idea if high-speed cameras have some kind of low upper bound on the focal distance or viewing angle, so if this laser-beam thing is even possible, I don't know how possible it is to even capture it with the technology the guys use on the show. Plus, the whole area would have to be really bright, right? I dunno. I'm not a cameraman, just a scientist.
 
Posts: 10 | Registered: 04-27-06Reply With QuoteEdit or Delete MessageReport This Post
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    Forums    Time Warp    TW: Show Ideas: Miscellaneous    The end of a laser beam

 
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