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

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

$X$-rays of which of the following wavelengths are hardest? (in $\mathring{A}$)

Electrons of mass $m$ with de-Broglie wavelength $\lambda$ fall on a target. The cut-off wavelength $\lambda_0$ is equal to [$h=$ Planck's constant,$c=$ velocity of light].

The figure represents the observed intensity of $X-$rays emitted by an $X-$ray tube as a function of wavelength. The sharp peaks $A$ and $B$ denote:

$X$-rays cannot be deflected by means of an ordinary grating due to