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← ScienceWhich mechanism causes redshift of light emitted from gravitational wells?
A)Gravitational time dilation reduces frequency✓
B)Doppler effect increases observed wavelength
C)Cosmological expansion stretches space
D)Refractive index shifts spectra
💡 Explanation
Photons lose energy escaping intense gravity because gravitational time dilation slows time observed by distant observers, therefore the frequency decreases toward the red end rather than a geometric stretch from recession affecting spectra.
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