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Which 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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