Recent content by arrell

I'm trying to ascertain the answers posed, if possible, with clear constructs in the physical world without resorting to 'observers'. As I said, I would like to use 'measurers' rather than 'observers'. As you so aptly point out, 'measurers' are only meaningful if photon detection points are...

The distance from the plane of frame 1 to frame 2 (orthogonal to the direction of v) is constant. No matter where a, b, c, and d are located on the x-axis of frame 1, when the photons are fired simulaneously towards the plane of frame 2, the photons will travel the same distance and at the same...

My understanding is that frame 2 is moving at v with respect to frame 1 (and points stationary in frame 1) and symmetrically frame 1 is moving at v with respect to frame 2 (and points stationary in frame 2) Photons have to emit from somewhere. In this case, I chose that photons emit...

Just a simple answer to my questions would be of real help to me and I would be very appreciative. I'm just simply trying to follow Einstein's paper line by line. My 'posit' was to try to find out if what I thought had to be a basis for one step in his derivation is what I think it is. If...

Thanks for the answer :smile: :smile: Do you mean that when the distance from e to f in frame 1 is measured by a frame 1 measuring stick that the separation = L ? Do you mean that when the distance from g to h in frame 2 is measure by a frame 2 measuring stick that the separation = L ?

For purposes of this question, we are considering a plane surface that is in frame 2 (ie moving at the same v as frame 2) and is parallel to the axis of the points in frame 1 and infinitesimally close to the axis of the points in frame 1. Also at the time of the lasers firing, the plane surface...

Suppose we have two frames (frame 1 and frame 2) which are passing each other infinitesimally close at a relative velocity v with respect to x axes in both frames.. We have two points, a and b, in frame 1 with separation L along the x axis. We have two other points, c and d also in frame 1...

your courtesy in taking the time to answer is very much appreciated ! It's going to take me some time to work thru. It should be interesting. Again, thanks !

Apologies. I reversed the A and B subscripts. Should have been: t(A) - t(B) = r(AB) / (c-v) While we are this stage of Einstein's formulation, there is something that puzzles me. When the photon reaches point B, it would seem like we might consider that the communication of the photon from...

From Einstein's paper, t(B) - t(A) = r(AB) / (c-v) which would seem to say that he considers that the light (photon) from the rest system is 'approaching' moving point B at less than c ?

Thanks for answering ! I'm a little confused, however. I thought that the speed of light (in a vacuum) was a postulate of Einstein's SR theory rather than a prediction. And Einstein seems to go on to do formulation based on light from the rest frame 'chasing' a point in the moving frame so...

I'm way past homework. (There is a hidden agenda behind the question.) It doesn't seem to pass any test of reason that the emitter of the photon 'knows' who is going to be doing the detecting. So it would seem to follow that, for a given type of emitter (element), the attributes of the photon...

what physical attribute(s) of the photon embody the Hubble velocity color shift?

Does a single photon have 'color'? If so, what physical attribute(s) of the photon embody the Hubble velocity color shift?