Nuclear & Particle Physics - X-rays

A nickel target (Z = 28) is bombarded with fast electron. The minimum electron kinetic energy needed to produce X-rays in the K-series is most nearly

A. 10 eV
B. 100 eV
C. 1000 eV
D. 10,000 eV
E. 100,000 eV

(GR8677 #26)

Solution:
Moseley’s law:

K-series refers to a transition from some outer state, n_i to the inner-most shell, n_f = 1.
(The order from inner to outer → K, L, M, N).

As the electrons come in from n_i = ∞,


Answer: D