The K _$\infty$ X Rays Arixing from a Cobalt (Z =

Multiple Choice

The K _$\infty$ x rays arixing from a cobalt (Z = 27) target have a wavelength of about 179 pm. The atomic number of a target that gives rise to K _$\infty$ x rays with a wavelength one-third as great ( $\approx$ 60pm) is:

A) Z = 9
B) Z = 10
C) Z = 12
D) Z = 16
E) Z = 46