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← ScienceWhich mechanism causes increased laser frequency when directed toward a massive body?
A)Gravitational blueshift via spacetime curvature✓
B)Doppler shift through accelerating reference
C)Refractive index alteration within atmosphere
D)Quantum entanglement mediated photon compression
💡 Explanation
Frame dragging causes light to gain energy when falling into a gravitational well because photons must expend ‘energy’ climbing, reversing a frequency-reducing "redshift" and causing increased 'blueshift,' rather than simple index changes alone.
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