The photoelectric effect involves the removal (ejection)of an electron.This process of removing an electron from an atom is known as:

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The process of removing an electron from an atom is known as ionization. The other options are not related to the photoelectric effect. Attenuation refers to the reduction of radiation intensity as it passes through a material. Transmission refers to the passage of radiation through a material without any absorption or scattering. Differential absorption is the difference in the degree of absorption of radiation by different materials or tissues.

The Photoelectric Effect Involves the Removal (Ejection)of an Electron