Who invented $X-$rays?

Find the wavelength of $K_\alpha$ $X$-rays.

An electron having de-Broglie wavelength $\lambda$ is incident on a target in an $X$-ray tube. The cut-off wavelength of the emitted $X$-ray is:

$X-$rays are known to be electromagnetic radiations. Therefore,the $X-$ray photon has

An $X$-ray tube operates at $50 \ kV$. It converts $1\%$ of the energy into $X$-rays. If the amount of heat produced is $495 \ W$, then the number of electrons striking the target per second is:

The $X-$rays produced in a Coolidge tube of potential difference $40 \ kV$ have a minimum wavelength of: