When cathode rays strike a metal target of high melting point with very high velocity,then

What $kV$ potential is to be applied on an $X$-ray tube so that the minimum wavelength of emitted $X$-rays may be $1 \text{ Å}$? $(h = 6.625 \times 10^{-34} \text{ J-s})$

How does the wavelength $\lambda$ of the $K_\alpha$ line in the $X$-ray spectrum depend on the atomic number $Z$?

The intensity of the $X$-ray beam emitted in an $X$-ray tube is increased by........

The maximum distance between the inter-atomic planes of a crystal is $10^{-7} \ cm$. The maximum wavelength of $X$-rays that can be studied by this crystal is ........... $\mathring{A}$.

An electron beam in an $X$-ray tube is accelerated through a potential difference of $50000 \ V$. These are then made to fall on a tungsten target. The shortest wavelength of the $X$-ray emitted by the tube is