8. A simple way to produce X-rays is to bombard some heavy metal target with high-speed electrons. If the shortest wavelength of the resulting X-rays is approximately 1Å, what is the bias voltage applied on the accelerating electrons?
(A) 12.4mV
(B) 12.4V
(C) 12.4kV
(D) 12.4MV
(E) 12.4GV.

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