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← ScienceWhich signal propagation change results because gravity warps spacetime near a black hole?
A)Blueshifted frequency increases greatly✓
B)Refraction remains near unity value
C)Inverse square law becomes unreliable
D)Signal velocity remains strictly constant
💡 Explanation
Frame-dragging causes extreme changes to spacetime; the mechanism is gravitational redshift/blueshift. Observed frequency drastically increases because of energy gain from gravity, therefore, a distant observer sees blueshift, rather than constant frequency shifts under flat spacetime conditions.
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