" Radiation with the minimum wavelength as well as the K x-ray lines are detected for a certain target. The energy of the incident electrons is then doubled, with the result that"

Question

A. the minimum wavelength increases and the wavelengths of the K lines remain the same
B. the minimum wavelength decreases and the wavelengths of the K lines remain the same
C. the minimum wavelength and the wavelengths of the K lines all increase
D. the minimum wavelength and the wavelengths of the K lines all decrease
E. the minimum wavelength increases and the wavelengths of the K lines all decrease"

Answer 1

E = hc/wavlength or
wavelength = hc/E.So if E is doubled then wavelength must be smaller. The K radiation from an element is a constant.

Answer 2

Thanks for helping DrBob222.