When cathode rays (tube voltage $\sim 10 \ kV$) collide with the anode of high atomic weight,then we get:

$X$-rays of wavelength $22 \, pm$ are scattered from a carbon target at an angle of $85^{\circ}$ to the incident beam. The Compton shift for $X$-rays is ......... $pm$.

What determines the hardness of the $X-$rays obtained from the Coolidge tube?

Assertion: $X-$rays travel with the speed of light.
Reason: $X-$rays are electromagnetic rays.

$X$-ray beam of intensity $I_0$ passes through an absorption plate of thickness $d$. If the absorption coefficient of the material of the plate is $\mu$,the correct statement regarding the transmitted intensity $I$ of the $X$-ray is:

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: