Bremsstrahlung radiation is generated through interaction of high-energy electrons with what aspect of the nucleus?

• A. The electron cloud electrons
• B. The electric field of the nucleus
• C. The atomic nucleus binding energy
• D. The neutron field

Answer: (B)

Bremsstrahlung comes from a fast electron being slowed (decelerated) by the Coulomb field of the atomic nucleus. That electric field exerts a force on the electron as it passes near the nucleus, causing it to change velocity and emit a photon. The key idea is the interaction with the nucleus’s electric field, not with the electron cloud, the nucleus’s binding energy, or neutrons. The radiation’s origin lies in the nucleus’s Coulomb field acting on the speeding electron, transferring some of the electron’s energy into the emitted photon.