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← ScienceWhich spectral shift appears if the gravitational potential changes?
A)Gravitational redshift✓
B)Doppler blueshift
C)Gravitational blueshift
D)Doppler redshift
💡 Explanation
Gravitational redshift emerges due to the equivalence principle. The frequency observed decreases, equivalent to kinetic energy loss, because photons lose energy climbing out of a gravitational well. Therefore, the spectrum shifts redward, rather than blue, due to motion effects such as the Doppler effect.
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