The minimum wavelength `lambda_min` in the continuous spectrum of X-rays is
A. Proportional to the potential difference V between the cathode and anode.
B. Inversely proportional to potential differece V between the cathode and anode
C. Proportional to the square root of the potential difference V between the cathode and the anode.
D. Inversely proportional to the square root of the potential difference V between the cathode and the anode.
