Recent content by Tuomaaca

I think i understand your question. Correct me if I'm wrong, but here's what I'm getting: The observer emits a "pulse of light" from his flashlight to the center of the mirror ("straight upward"). The light goes up. Since the mirror is moving with a velocity (let's say v), the light pulse...

do you need to find the E-field at the given r's, at the midplane of the cylinders?

So either we're moving through space in 1 direction, or we're stationary and space is expanding faster on one side of us than the other... ? It sounds to me like the same thing, just two different frames of reference.

for a 2-D wave, the amplitude would be divided by the circumference 2*pi*r. In 3-D, it would decrease by the surface area of the sphere 4*pi*r^2.

The wave doesn't lose energy, but intensity (energy is proportional to wavelength, intensity to the number of photons). The wave is spread out over a larger and larger surface (as it travels outward). As the radius increases, the photons are spread further and further apart, and the intensity...