alleryThe minimum wavelength $\lambda_{\min}$ in the continuous X-ray spectrum of an X-ray tube depends only on
Athe type of cathode
Bthe target material
Cthe accelerating voltage
Dthe filament current
Answer & Solution
Correct answer: C. the accelerating voltage
$\lambda_{\min} = \tfrac{hc}{eV}$, where $V$ is the accelerating voltage.
The cutoff is purely a kinematic limit set by how much energy a single electron can convert to a photon.
Target material affects the *characteristic* lines, not the continuous cutoff.
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