Question

 X-rays are produced by 

(a) oscillating circuits in special vacuum tubes 

(b) excitation of outermost electronic shell of an atom 

(c) excitation of inner electron of atom and is sudden annihilation of high energy free electrons. 

(d) nucleus of an atom, by the destruction of high energy particle.

Answer 1

X-rays are produced by  excitation of inner electron of atom and is sudden annihilation of high energy free electrons.