Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K shell electrons of tungsten have ionization energy 72.5 keV. X-rays emitted by the tube contain only

Moderate

A

A continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of 0.155 A
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 0.155 A and the characteristic X-ray spectrum of tungsten

Solution

Minimum wavelength of continuous X-ray spectrum is given by $λ_{\min} (in \overset{o}{A}) = \frac{12375}{E (eV)} = \frac{12375}{80 \times 10^{3}} \approx 0 .155$ Also the energy of the incident electrons (80 K eV) is more than the ionization energy of the K-shell electrons (i.e., 72.5 K eV). 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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