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 onlyA. a continous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of `~0.155 Å`B. a continous X-ray spectrum (Bremsstrahlung) with all wavelengthsC. the characteristic X-ray spectrum of tungstenD. a continous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of `~0.155 Å` and the characteristic X-ray spectrum of tungsten

Electrons with energy `80 keV` are incident on the tungsten target of

1.	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 onlyA. a continous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of `~0.155 Å`B. a continous X-ray spectrum (Bremsstrahlung) with all wavelengthsC. the characteristic X-ray spectrum of tungstenD. a continous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of `~0.155 Å` and the characteristic X-ray spectrum of tungsten
Answer» Correct Answer - D `lambda_(min)=1242/(80xx10^(3))=15.5xx10^(-3) nm=0.155 Å` Since `80gt72.5`, K-shell electron is knocked out, hence characteristic spectrum

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