A) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å
B) A continuous X-ray spectrum (Bremsstrahlung] with all wavelengths
C) The characteristic X-rays spectrum of tungsten
D) A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of ~ 0.155Å and the characteristic X-ray spectrum of tungsten
Correct Answer: D
Solution :
Minimum wavelength of continuous X-ray spectrum is given by \[{{\lambda }_{\min }}(in {\AA})=\frac{12375}{E(eV)}=\frac{12375}{80\times {{10}^{3}}}\approx 0.155\] Also the energy of the incident electrons (80 KeV) is more than the ionization energy of the K-shell electrons (i.e. 72.5 KeV). Therefore characteristic X-ray spectrum will also be obtained because energy of incident electron is enough to knock out the electron from K or L shells.
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