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

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

(a) b > R

(b) b ≈ R

(c) b < R

(d) no relation between b and R

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My question comes from PhotoElectric Effect in portion Quantum Physics of Engineering Physics I

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The correct option is (a) b > R

The explanation: 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.

 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.

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