Electrons with energy `80 keV` are incident on the tungsten target of an X - rays tube , k- shell electrons of tungsten have `72.5 keV` energy X- rays emitted by the tube contain only

Options

A. a continuos X-ray spectrum (Bremsstrablung) with a minimum wavelength of `-0.155 Å`
B. continuos X-ray spectrum (Bremsstrablung) with all wavelengths
C. the characteristic X-ray spectrum of tungsten.
D. a continuos X-ray spectrum (Bremsstrablung) with a minimum wavelength of `-0.155 Å` and the charateristic X-ray spectrum of tungsten

Answer

A

Explanation

`lambda_(min) = (hc)/(E) implies lambda_(min) = (12400)/(80 xx 10^(3)) Å = 0.155`