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. a continuos X-ray spectrum (Bremsstrablung) all wavelengthsS
C. a continuos 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

D

Explanation

As `lambda_(0) = (hc)/(E) = 1.55 xx 10^(-31) m`
`:. lambda_(0) =0.155 Å`
Which is the minimum wavelength of continuous X-rays which carry every equivalent electrons.
Now, as the energy of incident radiation is more than of K-shell electrons, the characteristic X-ray appear as peaks on the continuous spectrum.