Re: Simple question about light
- From: "Martin Hogbin" <goatREMOVETHIS123@xxxxxxxxxx>
- Date: Sun, 17 Dec 2006 17:22:30 -0000
"LuckyE" <D.Lucky.E@xxxxxxxxx> wrote in message news:1166359441.989756.313360@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I was just wondering, if you'd send a 1 second light pulse at a space
ship moving away from you with half the speed of light. Would the space
ship still pick it up as a 1 second pulse, or would it be longer?
I'd guess longer since it'll also be shifted, but was just curious
since it'll still be coming at the speed of light towards the ship.
The ship would measure the pulse to be longer than
one second for two reasons, firstly because they would
measure your clock to be running slowly (time dilation)
and secondly because you would have moved away
from them during the pulse meaning that the back of
the pulse would have further to travel than the front
(Doppler shift).
Martin Hogbin
.
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