Re: Dumb(Probably obvious) Light Speed Question
- From: "Dirk Van de moortel" <dirkvandemoortel@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 30 Sep 2005 12:41:20 GMT
<avcrow@xxxxxxxxx> wrote in message news:1128042654.599083.261100@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hi, I have a quick question. Forgive my ignorance. I had originally
> typed up a big question, but I'll just make it simple so I don't lead
> anyone to one train of thought. What happens when a mirror is moving at
> .5c from earth(ignoring rotation), and we are watching the mirror from
> earth, what would the reflection be like? Theoretically of course.
>
If you would send out two light signals with 1 second
between them, then you would see the reflections with
(1+v/c)/(1-v/c) seconds between them, which, for your
v/c = 1/2, amounts to 3 seconds.
So the frequency of light would be divided by 3 and the
wavelength multiplied by 3.
Since the wavelengths of visible light lie somewhere
between 390 nm and 750 nm, we wouldn't see any of that
anymore. The only stuff we would be able to see in the
mirror, is the radiation we send out in the ultraviolet band
somewhere between 130 and 250 (and that also manages
to make its way through the atmosphere), because that
would be shifted right into our visible window.
Dirk Vdm
.
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