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Article #7393

Re: Speed of light

#7393
From: Zdenek Radouch
Date: Sat, 08 Nov 1986 03:04
33 lines
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In article <241@sri-arpa.ARPA> KFL@MX.LCS.MIT.EDU writes:
[In the reply to the question whether the speed of light is decreasing]
>
>  Since 1982 the length of the meter (and hence of the inch, mile, etc)
>has been defined in terms of the length of the second and the speed of
>light.  This means that the speed of light is now constant by
>definition.

Let me remind you that the constant speed of light is not an implication
of the new definition of meter. The speed of light is assumed to be constant.
The definition is based on that assumption.

It doesn't make any sense to use this definition when questioning constant
speed of light. If we find that speed of light really is changing, we are
going to get rid of the definition. You are right in one thing; given this
definition, it's going to be difficult.

Consider this:
I am going to define the length of meter in terms of the length of the second
and the speed of my car. Then I can say that the speed of my car is constant...

zdenek

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 zdenek@CS.COLUMBIA.EDU  or 	...!seismo!columbia!cs!zdenek
 Zdenek Radouch, 457 Computer Science, Columbia University,
 500 West 120th St., New York, NY 10027
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From: zdenek@heathcliff.columbia.edu (Zdenek Radouch)
Newsgroups: sci.physics
Subject: Re: Speed of light
Message-ID: <3799@columbia.UUCP>
Date: Fri, 7-Nov-86 22:04:31 EST
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Posted: Fri Nov  7 22:04:31 1986
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