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EINSTEINIANA: DANGEROUS ANALOGIES



 
 
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  #1  
Old October 1st 12, 06:31 PM posted to sci.astro
Pentcho Valev
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Default EINSTEINIANA: DANGEROUS ANALOGIES

Initially the observer is stationary in the beach water but then starts walking out into the ocean with a speed v. Relative to him, the frequency of the ocean waves shifts from f=c/L to f'=(c+v)/L and their speed shifts from c to c'=c+v.

Initially the observer is stationary with respect to the sound source but then starts moving towards the source with a speed v. Relative to him, the frequency of the sound waves shifts from f=c/L to f'=(c+v)/L and their speed shifts from c to c'=c+v.

Initially the observer is stationary with respect to the light source but then starts moving towards the source with a speed v. Relative to him, the frequency of the light waves shifts from f=c/L to f'=(c+v)/L and their speed shifts from c to c'=....? Einsteinians?

Einsteinians' initial reaction: Help! Help! Divine Einstein! Yes we all believe in relativity, relativity, relativity!

The next day Einsteinians want to know who's asking the question:

http://game2gether.de/wordpress/wp-c...4-1024x819.jpg

Pentcho Valev
  #2  
Old October 2nd 12, 04:36 AM posted to sci.astro
Peter Webb[_5_]
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Default EINSTEINIANA: DANGEROUS ANALOGIES


"Pentcho Valev" wrote in message
...
For all waves (light waves included), when the observer starts moving
towards the wave source with a speed v, the speed of the waves relative to
him shifts from c to c'=c+v:


No. This is not true for light waves.
http://math.ucr.edu/home/baez/physic.../velocity.html or
http://en.wikipedia.org/wiki/Velocit..._of_relativity
both provide the correct formula.


 




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