Characteristic X-Ray Photons Result

Characteristic x-ray photons result

A) when an outer-shell electron is knocked out
B) when an inner-shell electron is knocked out
C) when outer-shell electrons fill the vacancy in an inner shell
D) when an outer-shell electron is knocked out and when outer-shell electrons fill the vacancy in an inner shell
E) when an inner-shell electron is knocked out and when outer-shell electrons fill the vacancy in an inner shell