I mean, by relativity, they can't travel faster than c (with respect to each other).If two photons travel in opposite directions, how fast do they travel relative to each other?Any object in the reference frame of photon A would see photon B moving away at the speed of light. This does not happen because of the Doppler shift (although it does happen), but because of time dilation (explained by special relativity) which says that the objects in reference frame A experience time passing more slowly in just the right amount that results in photon B moving away at the speed of light.
The previous paragraph is also true if you replace A by B, and B by A. In other words, reversing the situation still gives the same results.
The tricky part is that you are in different reference frame, in which you see both photons moving apart at the speed of light (no surprise there), so it APPEARS that they must be moving away from each other at twice the speed of light, but that appearance is deceiving (how you see things is different than how other observers see things). Any person in any of the inertial reference frames will see, and measure, a single value for the speed of light in a vacuum.
Time dilation is derived using a simple scenario and simple algebra, in the wikipedia link below.If two photons travel in opposite directions, how fast do they travel relative to each other?that's the problem with light we don't know , theoretically they would pass each other at a combined speed of 372000 miles per second, each would be doing the speed of light in its own direction, but we have no idea what the observed speed of each photon would be from the other photon, if you shine light through a medium such as glass or crystal it slows down but when it comes out the other side it is going faster again which quantum theory can't explainIf two photons travel in opposite directions, how fast do they travel relative to each other?You have stated that by relativity, they can't travel faster than c (with respect to each other).
Then what is your question? how fast do they travel relative to each other?
As per your statement { with respect to each other) they can't travel faster than c implies that that they travel with a speed of C.
======================================鈥?/div> If two photons travel in opposite directions, how fast do they travel relative to each other?
you are thinking about it the wrong way, pretend you are one of the photons, the other would be traveling at c according to the theory of special relativity, but something must happen, something has to change. that change is a doppler shift, the other photon would be deeply red-shifted
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