A beam of electrons striking a copper target produces X-rays. Its spectrum is a shown. Keeping the v

Question

A beam of electrons striking a copper target produces X-rays. Its spectrum is a shown. Keeping the voltage same if the copper target is replaced with a different metal, the cutoff wavelength and characteristic lines of the new spectrum will change in comparison with old as:

Professor PC Thomas Classes · Answer

(a): Cut off wavelength depends upon the accelerating potential difference so it will remain same and characteristic lines are dependent upon the energy gap between the energy levels of the element so these may change. Hence only option (a) is correct.