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Photon Selfproofs |
SELFPROOF 0611
- POUND-REBKA
CURRENT COSMOLOGY MODEL
The
Pound-Rebka experiment is a well known experiment to test the theory
of general relativity. It is a gravitational redshift experiment,
which measures the redshift of light moving in a gravitational field.
The test is based on the following principle: When an
atom transits from an excited state to a base state, it emits a
photon with a specific frequency and energy. When the same atom in
its base state encounters a photon with that same frequency and
energy, it will absorb that photon and transit to the excited state.
If the photon's frequency and energy is different by even a little,
the atom cannot absorb it (this is the basis of quantum theory). When
the photon travels through a gravitational field, its frequency and
therefore its energy will change due to the gravitational redshift.
As a result the receiving atom can no longer absorb it. But if the
emitting atom moves with just the right speed relative to the
receiving atom the resulting doppler shift will cancel out the
gravitational shift and the receiving atom will be able to absorb the
photon. The "right" relative speed of the atoms is
therefore a measure of the gravitational shift. The frequency of the
photon "falling" towards the bottom of the tower is
blueshifted. The gravitational blueshift was countered by moving the
emitter away from the receiver, thus generating a relativistic
Doppler redshift. (Wikipedia 28 Nov 2011)
MALTA COSMOLOGY TEMPLATE
- A photon converging on another object is blue gravityshifted. (see Argument 0606)
- A photon diverging from another object is red gravityshifted. (see Argument 0607)
COMMENTARY
- The
Pound-Rebka experiment confirms that photons moving away from a
gravity source are gravitationally redshifted.
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