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Which effect occurs on atomic clock timing when raised in gravitational potential?

A)Time dilation reduces clock frequency
B)Thermal expansion accelerates decay rates
C)Casimir effect modulates oscillation phases
D)Gravitational redshift slows observed rate

💡 Explanation

Gravitational time dilation, a consequence of Einstein's equivalence principle, causes a gravitational redshift lowering the observed frequency because photons lose energy escaping the gravitational field. The clock appears slower at higher potentials therefore redshift occurs, rather than blueshift in stronger gravitational fields.

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