The wavelength of $X$-rays is of the order of ...... $ \mathring A $.

The $X$-ray beam coming from the $X$-ray tube will be:

$X$-rays are used for the structural analysis of crystals because:

Frequency of the $K_{\alpha}$ $X$-ray for the element calcium $(Ca, Z = 20)$ is $8.95 \times 10^{17} \ Hz$. The frequency of the $K_{\alpha}$ $X$-ray for the element cadmium $(Cd, Z = 48)$ will be:

For characteristic $X$-ray of some material,which of the following relations is correct?

If the minimum wavelength of an $X$-ray is $2 \mathring{A}$,then the potential difference between the anode and the cathode is ...... $kV$.