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← ScienceWhich mechanism causes gravitational blue shifting of photons?
A)Spacetime curvature toward a gravitational source✓
B)Inverse square law of light intensity
C)Cosmological expansion of universal spacetime
D)Quantum vacuum energy fluctuations' polarization
💡 Explanation
Gravitational blue shift occurs because spacetime curvature increases near massive objects. Climbing out of a gravitational well shortens the photon's wavelength due to gravitational potential energy changing into photon energy; therefore, frequency increases, rather than cosmological expansion causing red shift under different conditions.
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