On 5/13/13 5/13/13 4:16 PM, Pentcho Valev wrote:
> On Monday, May 13, 2013 Tom Roberts (Honest Roberts) wrote:
>> On 5/12/13 5/12/13 - 3:29 AM, Pentcho Valev wrote:
>>>
http://www.aip.org/history/einstein/essay-einstein-relativity.htm John
>>> Stachel: "But here he ran into the most blatant-seeming contradiction,
>>> which I mentioned earlier when first discussing the two principles. As
>>> noted then, the Maxwell-Lorentz equations imply that there exists (at
>>> least) one inertial frame in which the speed of light is a constant
>>> regardless of the motion of the light source. Einstein's version of the
>>> relativity principle (minus the ether) requires that, if this is true for
>>> one inertial frame, it must be true for all inertial frames. But this
>>> seems to be nonsense. How can it happen that the speed of light relative
>>> to an observer cannot be increased or decreased if that observer moves
>>> towards or away from a light beam?"
>>>
>>> This IS nonsense. For any waves, if the observer starts moving towards
>>> the wave source with speed v, the frequency he measures shifts from f=c/L
>>> to: f' = (c+v)/L
>> It is not nonsense. Your claim is FACTUALLY WRONG. You are ignoring a
>> relativistic correction...
>
> How many times can you repeat the same red herring? You know that, when v is
> low enough, relativistic corrections are negligible and the frequency shifts
> from f=c/L to f'=f(1+v/c)=(c+v)/L
It is NOT a "red herring", it is a factual statement about the world we inhabit.
In particular, if v is small enough that you can ignore the relativistic
corrections, then you cannot distinguish c from c+v.
Moreover, if you can measure that frequency shift, you can ALSO measure the
similar shift in wavelength (both are first order in v/c). Indeed, the
wavelength shift is CONSIDERABLY easier to measure, as it was measured in the
mid 1800s for earth's orbital velocity (v/c ~ 0.0001), while the frequency shift
for that could not be measured until quite recently.
You are ignoring the effect on wavelength, which is the same order in v/c as the
effect on frequency. That makes your entire "analysis" invalid. You REALLY need
to learn how approximations are made....
> Accordingly, Honest Roberts, the speed of light relative to the observer
> shifts from c=fL to c'=f'L=c+v. No?
No! Because you are ignoring important effects that are required for agreement
with experiments. Remember the shift in wavelength is THE SAME ORDER IN v/c AS
THE SHIFT IN FREQUENCY.
This has nothing to do with "believing Einstein", it has to do with experimental
results, what science is, and how you are abusing it. Your personal ignorance
and arrogance prevent you from understanding it.
Tom Roberts