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Which phenomenon causes increased gamma ray frequency at Earth's surface?

A)Gravitational redshift via the equivalence principle
B)Doppler blueshift from atmospheric deceleration
C)Compton scattering with atmospheric molecules
D)Cherenkov radiation in upper atmosphere

💡 Explanation

Gravitational redshift causes photon frequency shift because as the photon falls, gravity does work, imparting more energy via the equivalence principle. Therefore, frequency rises rather than decreasing, because the photon gains, not loses, gravitational potential energy.

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