Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: IS ALL MOTION RELATIVE?
Replies: 6   Last Post: Mar 31, 2013 2:59 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Pentcho Valev

Posts: 3,241
Registered: 12/13/04
Re: IS ALL MOTION RELATIVE?
Posted: Mar 24, 2013 8:03 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

http://www.pitt.edu/~jdnorton/papers/companion.pdf
John Norton: "Einstein could not see how to formulate a fully relativistic electrodynamics merely using his new device of field transformations. So he considered the possibility of modifying Maxwells electrodynamics in order to bring it into accord with an emission theory of light, such as Newton had originally conceived. There was some inevitability in these attempts, as long as he held to classical (Galilean) kinematics. Imagine that some emitter sends out a light beam at c. According to this kinematics, an observer who moves past at v in the opposite direction, will see the emitter moving at v and the light emitted at c+v."

Is this prediction of Newton's emission theory of light confirmed experimentally? Yes it is. If the speed of light is c'=c+v, then the frequency the observer sees (measures) is f'=(c+v)/L=f(1+v/c), where L is the wavelength and f is the frequency seen by an observer at rest relative to the emitter.

That is, the assumption c'=c+v entails the formula f'=f(1+v/c); the latter has been confirmed countless times:

http://rockpile.phys.virginia.edu/mod04/mod34.pdf
Paul Fendley: "Now let's see what this does to the frequency of the light. We know that even without special relativity, observers moving at different velocities measure different frequencies. (This is the reason the pitch of an ambulance changes as it passes you it doesn't change if you're on the ambulance). This is called the Doppler shift, and for small relative velocity v it is easy to show that the frequency shifts from f to f(1+v/c) (it goes up heading toward you, down away from you). There are relativistic corrections, but these are negligible here."

Pentcho Valev



Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.