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What is the relation between the interaction parameter, ‘b’, and atomic radius, R, for the Compton Effect?

What is the relation between the interaction parameter, ‘b’, and atomic radius, R, for the Compton Effect? Correct Answer b ≈ R

If b ≈ R, the incident photons are scattered by the electron of the atom and the electron itself gets scattered. This phenomenon is known as the Compton effect. If b < R, the photon is directly converted into an electron-positron pair, known as pair production. If b > R, it means the interaction parameter is greater than the atomic radius. In this case, the electron is ejected by the photon and it is known as the Photoelectric effect.

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