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← ScienceWhich mechanism dictates observed periodicities from distant quasars?
A)Gravitational lensing induces time dilation✓
B)Relativistic beaming lowers apparent luminosity
C)Doppler shift decreases observed frequency
D)Cosmological inflation redshifts emission spectra
💡 Explanation
Gravitational lensing causes variations in the observed light curves because photons travel different paths and experience different gravitational potentials, leading to time dilation of lensed images. Therefore, the lensing delays vary, rather than relativistic beaming or cosmological effects dominating.
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