How are $X$-rays produced in the laboratory?

The filament current in the electron gun of a Coolidge tube is increased while the potential difference used to accelerate the electrons is decreased. As a result, in the emitted radiation

$X-$rays are in nature similar to

In vacuum,an electron of energy $10 \ keV$ hits a tungsten target. The emitted radiation will be:

For hard $X$-rays,which of the following is true?

The distance between interatomic lattice planes is $10\ \mathring A$. The maximum wavelength of $X$-rays that can be diffracted by this crystal is ......$\mathring A$.