Re: NEWTON AND MAXWELL REASONABLE, EINSTEIN ABSURD

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#505

From: harald
Date: Thu, 06 May 2010 11:22

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On May 1, 6:25 am, Pentcho Valev <pva...@yahoo.com> wrote:
> According to Newton's emission theory of light, the SPEED of light
> varies with the speed of the observer.
>
> According to Maxwell's theory, the SPEED of light varies with the
> speed of the observer.
>
> The assertion that the SPEED of light varies with the speed of the
> observer is physically reasonable. The assertion that the WAVELENGTH
> of light varies with the speed of the observer is absurd.

[..]

As that kind of fuzzy and statements is a general source of confusion,
here a little clarification:

Neither Newton nor Maxwell defined "speed" relative to an "observer";
the speed of a physical entity can in those theories *not* be affected
by observation. However, in Maxwell's electrodynamics the Doppler
effect (variation of observed wavelength due to variation of either
the velocity of the source or that of the observer) does exist (it's
even easy to understand) and is *not* absurd.

SRT is based on Maxwell's electrodynamics and maintains the non-causal
relationship between the propagation of a light ray and the motion of
an observer. If at sundown you start walking in the direction of the
Sun, you don't slow down the light from the Sun that is on its way to
Earth - that would physically *not* be reasonable. :))

Harald

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From: harald <hvan@swissonline.ch>
Newsgroups: sci.physics.relativity,sci.physics,fr.sci.physique,fr.sci.astrophysique
Subject: Re: NEWTON AND MAXWELL REASONABLE, EINSTEIN ABSURD
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