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Re: General Relativity ?



Wait a minute...

I thought Ken's question was essentially about how to interpret the
gravitational red/blueshift. Orbiting space station up there, observer down
here. Sam seems to introduce other complications(orbiting station with
speed close to c??).

Mark

At 08:41 25/11/98 -0500, Samuel Held wrote:
Ken,
Actually, it is a little bit of both if the station's velocity
is close to c. The main reason we see Red Shift's is due to the Doppler
Effect. The reason the light is bent is due to massive bodies, i.e.,
stars bending the space-time around them. The light follows a geodesic
(shortest distance) path through space which may take the beam through
this bent portion of space-time (some differential geometry is usually
required). It is a non-trivial problem but the overall concept is not
bad. Hope that helped.

Sam Held

-----Original Message-----
From: Ken Fox [mailto:kfox@STEGA.SMOKY.ORG]
Sent: Tuesday, November 24, 1998 6:27 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: General Relativity ?


A signal is sent from an orbiting station to the ground. The receiver
will
measure the in coming frequency to be greater than the sender would
measure it. The
question I was asked is whether this is due to the earthbound clock
running at a slower rate or the signal actually increasing in frequency
or
can you really tell? I think I am in the latter camp.


Ken Fox
Smoky Hill High School
16100 Smoky Hill Rd
Aurora,CO 80015
303-693-1700(w)
303-850-7537(H)
kfox@stega.smoky.org

Mark Sylvester
United World College of the Adriatic
34013 Duino TS
Italy.
msylvest@spin.it
tel: +39 040 3739 255