In an X-Ray Tube, Electrons with Energy 38 KeV Are

In an X-ray tube, electrons with energy 38 keV are incident on a cobalt (Z = 27) target. Determine the cutoff wavelength for X-ray production.

A) 1.9 × 10^-11 m
B) 2.4 × 10^-11 m
C) 2.8 × 10^-11 m
D) 3.3 × 10^-11 m
E) 3.6 × 10^-11 m