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Which risk increases when a GPS satellite's altitude deviates significantly from its designated Kepler orbit?

A)Signal drift requires complex adjustments
B)Increased atmospheric drag abruptly slows speeds
C)Doppler shift induces frequency instability
D)Atomic clock desynchronization with Earth

💡 Explanation

Atomic clocks maintain precise timing through time dilation dictated by Einstein’s equivalence principle; differing gravitational potentials cause clock desynchronization because gravitational field strength alters clock rate compared to Earth-based counterparts, therefore requiring continuous relativistic correction rather than stability due to other perturbations.

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