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Which mechanism causes gravitational redshift observed from pulsars?

A)Spacetime curvature increases photon wavelength
B)Doppler effect decreases signal frequency
C)Atmospheric scattering reduces photon energy
D)Quantum entanglement shifts energy levels

💡 Explanation

Gravitational redshift occurs because spacetime curvature near the pulsar stretches the wavelength as photons climb out of the gravitational well. Therefore, the detected frequency is lower, rather than frequency decreasing from Doppler shifts or scattering effects.

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