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Which mechanism causes slower GPS satellite clock rates?

A)Gravitational time dilation via spacetime curvature
B)Relativistic Doppler effect of light
C)Special relativity affecting crystal oscillators
D)Atmospheric refraction altering signal speed

💡 Explanation

Increased distance from Earth's center imposes less gravitational experienced because a weaker gravitational field induces spacetime curvature, subsequently gravitational time dilation, slowing clocks. Therefore, gravitational time dilation is the cause, rather than simple Doppler effects or atmospheric refraction.

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