Question

The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.

Answer 1

(c) the intensity remains unchanged
(d) the minimum wavelength decreases

Cutoff wavelength $\left({\lambda }_{\min }\right)$ is given by
${\lambda }_{\min }=\frac{h\mathrm{c}}{eV}$
Here,
h = Planck's constant
c = Speed of light
V = Accelerating voltage
e = Charge of electron

If the potential difference applied to an X-ray tube $\left(V\right)$ is increased, then the minimum wavelength (cutoff wavelength) gets decreased.
Intensity is not affected by the potential difference applied.