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← ScienceWhich effect occurs when measuring a distant object's spacetime near a supermassive black hole?
A)Gravitational redshift of emitted photons✓
B)Observed blueshift of matter infall
C)Length contraction along radial trajectory
D)Increased rate of nuclear fusion
💡 Explanation
Gravitational redshift happens because photons lose energy escaping the intense gravitational field through the spacetime around a black hole; the **Shapiro delay** decreases their observed frequency relative to the source, therefore they appear redder, rather than exhibiting blueshift phenomena.
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