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So - as I have been saying for last 3 years, a photon shifts oppositly to a clock in the gravity potential!
So - what about what Jeff says in post 25? He is saying that photons do not shift in the gp, and that they only appear shifted as a symptom of clocks being time dilated.Do you share this viewpoint @alancalverd ?
Well as I said already. I give up.
Photons 'do not' behave the same as clocks in the gravity potential.Remember that when we moved clock G to A, that A observes the clock as blueshifted compared to when it observed clock G on the ground...So if a photon behaves the same as a clock, then a photon released at G will be observed by A as blueshifted, when it arrives at A... BUT a photon released at G and observed by A will be REDSHIFTED Colin, won't it?
I'm with Jeffrey. You are incorrigible. Perhaps Grandma Joan will persuade you of the error of your thinking - give her my best wishes.
- A photon loses energy as it climbs out of a gravitational well- If a photon loses energy, its frequency is lower: This is gravitational redshift for escaping photons.
Well I'm with @evan_auQuote from: evan_au on 27/03/2018 21:59:39- A photon loses energy as it climbs out of a gravitational well- If a photon loses energy, its frequency is lower: This is gravitational redshift for escaping photons....Alan, sometimes I wonder if you purchased your physics degree off that dodgy dude round back of Kings Cross station (chuckle)
Alan, surely no matter if you are travelling from Kings Cross, or Stevenage, your sharp eye would be checking the clock at every station, noting that each is running faster than the last, and you will be scratching your head as to how much energy your train has actually lost?
don't know why you have to complicate the matter. Einstein himself said that light (not a light source) loses energy climbing out of a gravitational well. If the light has lost energy, it is redshifted.
By all means. Seen from Cambridge, the KX clock will be ticking slower than the STV clock, which will be ticking slower than the CAM clock. And the 21 cm hydrogen line photon from a lamp at KX will have a greater red shift than one emitted from STV. Exactly as observed in laboratories and observatories, and predicted by general relativity, for the last several years.
Yes " the energy loss equals the gravitational potential difference between the source (KX) and the observer (STV or CAM)", but the blueshifted clocks at the stations are also equal to the gravitational potential difference. But note that the redshift of the light (train) is 'measured' via the clock at the station.
1. KISS2. Facts.