Characteristic $X$-rays are produced due to

The diagram shows a graph between the intensity of $X$-rays emitted by a molybdenum target and the wavelength,when electrons of $30 \ keV$ are incident on the target. In the graph,one peak corresponds to the $K_\alpha$ line and the other peak corresponds to the $K_\beta$ line.

In an $X$-ray spectrum,if the wavelengths of $K_\alpha$,$K_\beta$,and $K_\gamma$ lines are $\lambda_\alpha$,$\lambda_\beta$,and $\lambda_\gamma$ respectively,then:

When $0.50\; \mathring{A}$ $X$-rays strike a material,the photoelectrons from the $K$-shell are observed to move in a circle of radius $23\; mm$ in a magnetic field of $2 \times 10^{-2}\; T$ acting perpendicularly to the direction of emission of photoelectrons. The binding energy of $K$-shell electrons is $..........\; keV$.

$X$-rays are produced in an $X$-ray tube at a given accelerating voltage. The wavelength of the continuous $X$-rays will be in the range of .......

$X$-rays will travel the minimum distance in which of the following materials?