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← ScienceWhich mechanism causes redshift in photons escaping a dense star?
A)Gravitational time dilation increases wavelength✓
B)Length contraction compresses photon paths
C)Quantum entanglement alters photon frequency
D)Doppler shift decreases observed frequency
💡 Explanation
Gravitational time dilation near the star stretches the photon's wavelength; because, due to the equivalence principle, gravity warps spacetime, affecting time's passage. Therefore, redshift increases, rather than causing blueshift from a closing Doppler effect.
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