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← ScienceWhich observational effect increases near a black hole's event horizon?
A)Gravitational redshift of emitted photons✓
B)Blueshift of infalling matter only
C)Increased observation of Hawking radiation
D)Stability of particle trajectories inward
💡 Explanation
Gravitational time dilation causes increasing redshift because equivalence dictates that gravitational potential affects time the same way acceleration would; therefore, photons lose energy escaping gravity, rather than gaining blueshift from inward motion under gravity.
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