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← ScienceWhich mechanism causes gravitational redshift of light photons?
A)Spacetime curvature affecting photon energy✓
B)Doppler shift with accelerating observers
C)Compton scattering reducing photon frequency
D)Refraction altering apparent wavelengths
💡 Explanation
The gravitational redshift happens because spacetime curvature near a massive object affects photon energy, reducing its measured frequency as it moves away from the gravity well. Therefore, the redshift is due to the curvature, rather than Doppler shifts or scattering, which are different effects.
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