# SR Question

Tom Mattson said:
No, he [Grounded] isn't. He is just re-hashing the physics of the 19th century. And if we all did what he is doing, we'd all be making some serious anti-progress.
I'll agree that he isn't attacking SR. He's simply denying it.

This is irrelevant! Despite your beliefs to the contrary, the outcome of real experiments cannot be changed as capriciously as those of thought experiments.
Note:To investigate/re-hash what Grounded is saying is "anti-progress", investigating/re-hashing, is anti-progress?

Here is a simple thought experiment that has been discussed in various forms over the years.

1. In the Einstein stationary platform and moving train experiment an observer O' on the train located at M' on the the train heading to a photon source at B, arrives at the midpoint M of A and B, two light sources, just as the sources emit photons along the line of motion of the train. M, A and B are on a stationary frame. The observer determines her v' wrt M, and t'1 (the time from when she passed through M, say t'0) detects a photon emitted from B and later detects a photon from A at t'2. SR tells us the photons emitted in the stationary frame were not emitted simultaneously in the moving frame. This is a given.

From the information in front of you, t'0, t'1 and t'2, v', the spatial location of M' at t'0, or M'(t'0), determine if M'(t'0) was at the midpoint of the photons at t'1, when the B photon was detected on the moving platform. All values are moving frame values. You may use the given information that when M'(t'0) was colocated with M in the stationary platform that the photons were emitted from A and B simultaneously.

2. In the Michelson-Moeley experiment virtually all descriptions I have seen have the photons moving transverse to the photon moving 'parallel' with the motion of the source reflected at an angle, as if the photon were bounced ahead.However, the photon is directed, or should be directed, at an angle of 90 degrees wrt the transverse moving photon. Therefore, the reflected photon will arrive behind the moving photon and will pass through the half-silvered mirror above the point from which it was originally reflected downward.

In capturing the reflected photons in the eye piece (now moving parallel to each other) the photons upward moving parallel photons should be separated by an amount vt, the distance the sources moved during the time t, the time of roundtrip of the downward moving photon. Both photons interfer orthogonally before their final passage through the silvered mirror on their path to the eye piece. The silvered mirror is at 45 degrees to the direction of motion of the downward, tranverse, photon.

From this, calculate the optical path length difference expected from a given range of V, the velocity of the source for a.) any 24 hour period and, b). any one year period. To combine the calculations you may plot t(years) exponentilly using real hours for the 24 hour period.