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← ScienceWhich effect occurs on light's frequency owing to gravitational redshift?
A)Decrease, due to time dilation✓
B)Increase, because of spacetime expansion
C)Remains constant, under principle equivalence
D)Blue shift; source approaches Earth
💡 Explanation
Gravitational redshift decreases light frequency, because spacetime is curved by gravity—time dilation is occurring, reducing its energy through the process. Therefore, frequency must decrease, rather than remain constant due to some external frame, or shift to blue under a reversed situation.
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