Rakesh Singh asked:
Does time stop for photons travelling at the speed of light?
Tamela - He’s probably been studying relatively longer than I have, but I’ll do my best. So, absolutely right. If the particle is approaching a speed of light and had a clock on it, we as observers of that particle going extremely fast would see that time slows down and approaches this sort of eventual stopping. It is impossible to imagine the frame of reference at the speed of light- special relativity doesn’t really deal with that. It takes the speed of light as a constant and that’s regardless of what speed you're going at. So, even if you're 99% at the speed of light, you're still measuring c as c. So in that sense, it is difficult to answer what kind of time is the photon experiencing. But just to say that if you were a particle, maybe at 99% at the speed of light, in your own frame of reference, time is moving normally. You have a much faster ticking clock compared to the observer that sees that time has nearly slowed down. Actually, you’ve probably heard of this, but we’ve experimentally confirmed time dilation here on Earth. There was an experiment back in the ‘70s that put these atomic clocks on commercial aircraft and had them fly around the Earth, both in the eastward direction and the westward direction, and we’re able to compare, once they got back on Earth with sort of naval observatory clocks. Actually, there was this difference because they were moving faster than the Earth’s rotation at some point.
Chris - The great pyramids also distort time because they're very massive and so, they bend space time. So, time travels at a different rate.
Tamela - Exactly, yeah.
Chris - Yes, which that really does blow my mind – the whole concept of you going near something very massive and time changes. So, you go to Egypt, sit next to a pyramid and actually, time is distorted. So maybe the Egyptians were on to something when they said that they were going to try and make their pharaohs immortal because relative to the rest of us they are ageing more slowly.
Tamela - To extend this even further, if you go to a black hole and kind of start falling into a black hole, you're observer is seeing that time has nearly stopped for you as you fall towards it because you’ve warped that time so much. So yeah, lots of interesting things going on.
Suppose we are in a lab whose frame of reference we label S. Let the particle of interest be at rest in an inertial frame S' which is moving relative to S with speed v.
well you might as well ask if time stops for an electron travelling down a copper wire. "The electron" doesn't travel down the cable, it transfers energy down the wire at the speed of light (or close to it) and we measure the effect on whichever electron is at the other end of the wire, usually with the wrong assumption that its the same electron as the one we set off at the other end of the wire. It isn't. So what is travelling is energy which we detect as an electron. Same with photons, they only exist where we detect them.
Photos have a wavelength that can be shifted but otherwise preserve their information content over vast distances. This is how the composition of stars can be determined. I doubt that this is like time being stopped for the photon. It has no rest mass so does time even apply in the same way? It is affected by gravity but does that include time dilation? jeffreyH, Fri, 21st Mar 2014
The phrase experience implies awareness. Panprotoexperientialism is an interesting topic but I believe you are after the most currently accepted view about light and time. To get at this you need to look at the current definitions for photons and time.
Omaughuntinaser, I've deleted your post since it included some language that exceeded the family-friendly nature of this site. In addition, please review the site's acceptable usage policy, as posts are supposed to foster respectful discussion and yours have crossed that line.
I found this in my notes from a few months ago, when I was thinking about claims that information could travel back through time.
What Brian Greene is saying there is that photons travel along light-like world lines. There's no controversy there. His description of motion through space vs motion through time is one way of describing time dilation and length contraction.
The most fun thing to watch is to see no one here EXPLORING,only DEFENDING, the more than ridiculous science dogma's.
The only useful question is 'does it work?', and, judging by my GPS position, the answer is 'yes'. dlorde, Fri, 4th Apr 2014
At least this is true in your case... lightarrow, Sat, 5th Apr 2014
At least this is true in your case...
I gotta say! There's a couple cranks on this site! Spinning wheels, no gain.
Light is the true relativity. It is applied across the universe equally. Its speed is the same through every inertial frame of reference. It doesn't know nor care what gravity or perception speed the inhabitants have... Light is cosmic.., identical across all of it... Forget what you've read about light photon's duality... The delivery of light has two separate and distinct parts and operations... First there is the particle that is called a photon travelling at the speed of light that is transmitting a single frequency that is radiating outward.., also at the speed of light. The key to producing the light spectrum is that the forward going wave front cannot get out of the way of the transmitter radiating it.., so it blue shifted into extinction... All parts of a wave cannot be in the same place at the same time. But outward from that center line of travel, as the degree increases, one will see lower and lower wave lengths traveling outward. They are simply being blue shifted less and less. From that forward direction to the 90 degree point.., one will see the entire electromagnetic spectrum, which of course includes the visible portion, being laid out to a flat plane just ahead of the photon in all directions around the exact center.... That plane representing the wall in your living room for example... The visible spectrum will look like colored circles much like a target. Light produces a virtually endless, or cosmic wide electromagnetic spectrum.. From the ultimate self extinguishing shortest wavelength possible to the lowest which is cosmos long...Size wise, the visible will take up the equivalent to a pixel on your monitor... It will be make one tiny spec of light that with many more photon arrivals will make up the entire image of their source... We then with our frame's particular mental perception speed, adjusted up or down by our velocity through the cosmos, will look for the frequency that equates to what we have evolved to see as say the color blue... Once we alligh with what is familiar to us we will have found our frame's portion of the cosmic electromagnetic spectrum... It will be a different portion for every frame... But each will see the frequency that to them is blue. This is all seen and developed from proven science... Light is the true relativity... There is no time... There are *many* more details at http://www.thecosmosreconsidered.com No more paradoxes. There is no time. Time is simply a survival mechanism. A hard drive storage system in our brain. We can 'remember' what happened to Fred when he jumped off that cliff trying to fly like a bird... :) That doesn't mean there is Time... It's an illusion. Floyd Baker, Fri, 10th Apr 2015