Which of the following statements is true about the interaction of electromagnet

Question

Which of the following statements is true about the interaction of electromagnetic radiation with matter?

1) Photoelectric absorption involves the interaction of a photon with the nucleus of an atom.

2) Rayleigh scattering involves an inelastic collision of a photon with an outer-shell electron with negligible binding energy, after which that electron is ejected from the atom.

3) The main phenomena associated with X-ray imaging are Rayleigh scattering at low photon energies and pair production at high photon energies.

4) The main phenomena associated with X-ray imaging are photoelectric absorption at low photon energies and Compton scattering at high photon energies.

5)None of these statements are true.

Explanation / Answer

1. False. Photons interact with the outer electrons and not the nucleus.

2. False. The scattering from molecules and very tiny particles (< 1 /10 wavelength) is predominantly Rayleigh scattering. For particle sizes larger than a wavelength, Mie scattering predominates. This scattering produces a pattern like an antenna lobe, with a sharper and more intense forward lobe for larger particles.

3. False 4th is the actual true statement

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