Comments on: Time Dilation – a short introduction

By: Radu C

Radu C — Mon, 01 Nov 2010 12:07:03 +0000

To exemplify the energy and frequency differences, if both ships emitted green photons (picked because green is in the in about the middle of the visible spectrum: let’s pick 550nm), while both ships would report their own emitted photons as green, the first ship would report the second ship’s photon as blue or violet (shorter wavelength: towards 400nm), while the second ship would report the first ship’s photon as red (longer wavelength: towards 700nm). A target stationary receiver would report the same as the stationary ship, while a receiver matching the second ship’s speed would match its report too. Reports would probably go into the infrared and ultraviolet a lot more at though speeds, but the principle would be the same. I am not a physicist and my perception could be UFO flood

By: Radu C

Radu C — Mon, 01 Nov 2010 11:46:37 +0000

One thing I noticed in the video is that regardless of the motion of the observer, both photons have the same X coordinate in space, which means it doesn’t behave like a baseball pitched on a moving truck. I’d expect something else: the second photon would have more energy than the first, and possibly different wave length too (shorter in the second than the first), if both ships use identical lasers. Both observers measure the same speed of light because their distance and time measuring devices depend on light. Without something way faster to measure light with, we’re stuck with this. Try this with sound to measure sound What puzzles me is at the end: why does the moving ship observe a slower clock on the stationary ship when it’s obviously faster?

By: whodat

whodat — Mon, 25 Oct 2010 22:03:25 +0000

1987, must have been about 9yo when i saw an episode of the Disney cartoon Duck Tales called “Time Teasers”

part 1 – http://www.youtube.com/watch?v=77t3kGBD8ng
part 2 – http://www.youtube.com/watch?v=QDEcD7grJao

By: John

John — Mon, 25 Oct 2010 08:29:53 +0000

Gary, thats the doppler effect youre thinking of

By: Julien S.-R.

Julien S.-R. — Sun, 24 Oct 2010 19:49:17 +0000

Fascinating concepts, but I’d take diagrams and equations over cheap animations any day.

By: gary

gary — Sun, 24 Oct 2010 18:01:15 +0000

i enjoyed the bit with the space ladies in their silver pants….
they could have simplified it a bit more though, police sirens sound longer the further away they are but when right next to you are quick and as they go off again the sound stretches again,

By: Lady Claire

Lady Claire — Sun, 24 Oct 2010 13:21:19 +0000

Very interesting to watch.

LC x

By: john threlfall

john threlfall — Sun, 24 Oct 2010 13:17:17 +0000

I don’t get it ????