- #1
bhornbuckle75
- 11
- 0
Ok my question has to do with a thought experiment which seems to allow faster than light transfer of information. I'm sure there is a problem with it...I just can't seem to figure out what that problem is...so I thought you guys could help.
First you build a sort of telegraph system that uses a laser beam which is constantly on. One station shines a laser at the other, and by rocking the beam back and forth it either hits the tiny receiver or does not...in other words imagine a laser pointer hooked onto a sort of pivot. It is adjusted so that the beam hits a receiving unit, but the receiving unit is very small. When the laser hits the unit then that makes a tone that the person monitoring the receiver can hear. Now by turning the laster slightly on its pivot it can be made to miss the unit and the tone will go off. If you wanted to you could put a tiny spring onto the pivot so that it holds the laser in a position where the beam misses the reveiver...then by pushing down on the laser pointer it will pivot and the beam will hit the receiver and make a tone...then by letting up the spring makes it pivot back out of range of the reciever...(In this way it is basically just like a telegraph system capable of sending little dots and dashes)
Ok sorry for all that background...I just wanted to make the operation of the device as clear as possible...now on to my thought experiement.
Imaging the reciever is on the moon and the laser is on the earth...basically the same set up as before, except of course in this set up the laser Pointer is VERY powerful and can make a beam hit the receiver on the moon with no problem. Ok so the long beam of light is just a straight beam and when you move it it instantly moves the straight beam as well...therefore the longer the beam, the more distance the information will have to travel from sender to receiver...and therefore the faster the information will be traveling.
Now Light takes something like 1.5 seconds (thats approximate...I don't remember exactly but I think I am close) to go from the moon to the earth, or vice versa. Since the long beam of light is just a straight beam like a stick and it moves at the same rate on the moon that it does on Earth then the telegraph information would travel basically instantly every time you wobble the beam would it not? Does this not allow for faster than light transfer of information? I am fairly certain that I am correct in assuming that the laser beam would not bend...but if I am wrong about this ...what if you were to substitute some kind of exceptionaly long stick that was perfectly rigid that went from the Earth to the moon...(same set up as before...just using a long stick instead of a beam of light...I didnt use this Idea before because it is hard to visualize a stick which could be this long and still be completely rigid...so it is basically hypothetical...none the less it too would seem to transfer information faster than light...you could even get rid of the reveiver and just have the guy watching the stick on the moon to see when it wiggles)
Anyway...could someone please help me see where it is that I am wrong...(assuming I am of course and that transfer of info faster than light speed is impossible )
First you build a sort of telegraph system that uses a laser beam which is constantly on. One station shines a laser at the other, and by rocking the beam back and forth it either hits the tiny receiver or does not...in other words imagine a laser pointer hooked onto a sort of pivot. It is adjusted so that the beam hits a receiving unit, but the receiving unit is very small. When the laser hits the unit then that makes a tone that the person monitoring the receiver can hear. Now by turning the laster slightly on its pivot it can be made to miss the unit and the tone will go off. If you wanted to you could put a tiny spring onto the pivot so that it holds the laser in a position where the beam misses the reveiver...then by pushing down on the laser pointer it will pivot and the beam will hit the receiver and make a tone...then by letting up the spring makes it pivot back out of range of the reciever...(In this way it is basically just like a telegraph system capable of sending little dots and dashes)
Ok sorry for all that background...I just wanted to make the operation of the device as clear as possible...now on to my thought experiement.
Imaging the reciever is on the moon and the laser is on the earth...basically the same set up as before, except of course in this set up the laser Pointer is VERY powerful and can make a beam hit the receiver on the moon with no problem. Ok so the long beam of light is just a straight beam and when you move it it instantly moves the straight beam as well...therefore the longer the beam, the more distance the information will have to travel from sender to receiver...and therefore the faster the information will be traveling.
Now Light takes something like 1.5 seconds (thats approximate...I don't remember exactly but I think I am close) to go from the moon to the earth, or vice versa. Since the long beam of light is just a straight beam like a stick and it moves at the same rate on the moon that it does on Earth then the telegraph information would travel basically instantly every time you wobble the beam would it not? Does this not allow for faster than light transfer of information? I am fairly certain that I am correct in assuming that the laser beam would not bend...but if I am wrong about this ...what if you were to substitute some kind of exceptionaly long stick that was perfectly rigid that went from the Earth to the moon...(same set up as before...just using a long stick instead of a beam of light...I didnt use this Idea before because it is hard to visualize a stick which could be this long and still be completely rigid...so it is basically hypothetical...none the less it too would seem to transfer information faster than light...you could even get rid of the reveiver and just have the guy watching the stick on the moon to see when it wiggles)
Anyway...could someone please help me see where it is that I am wrong...(assuming I am of course and that transfer of info faster than light speed is impossible )