Q. The energy of a photon of characteristic $X$-rays from a Coolidge tube comes from
A) The kinetic energy of the striking electron
B) The kinetic energy of the free electrons of the target
C) The kinetic energy of the ions of the target
D) An electronic transition of the target atom
Explanation
(d) The energy of $X$-ray photon is obtained from a coolidge tube by an electronic transition of target atom such as $K_{\alpha}$ line is obtained from transition from $L$ orbit in $K$ orbit
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.