When high energetic electron beam , (i.e., cathode rays) strike the heavier metal, then X-ray are produced. Spectrum of X-ray are classified into two categories: (i) continous spectrum, and (ii) characteristic depends only on the potential difference across the electrode. But wavelength of characteristic spectrum depends on the atomic number `(z)`.
The production of characteristic X-ray is due to the

Options

A. continuous acceleration of incident electrons towards the nucleus
B. continuous ratardation of incident electrons towards the nucleus
C. electron transition between inner shells of the target atom
D. electron transition between outer shells of the target atom

Answer

C

Explanation

Characteristic X-ray series due to transition of electrons.