Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K-shell electrons of tungsten have 72.5 keV energy. X-rays emitted by the tube contain only [2000]

Question

Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K-shell electrons of tungsten have 72.5 keV energy. X-rays emitted by the tube contain only [2000]

Smart Achievers · Accepted Answer

(4)

Minimum wavelength of continuous X-ray spectrum

$λ_{\min} = \frac{h c}{E}$

$∴$ $λ_{\min} = \frac{12375}{80 \times 10^{3}} Å = 0.155 Å$ $[∵ E = 80 keV given]$

Energy of incident electrons is greater than the ionization energy of electrons in the K-shell, the K-shell electrons will be knocked off. Hence, characteristic X-ray spectrum will be obtained.

Solution

Q.
Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube. K-shell electrons of tungsten have 72.5 keV energy. X-rays emitted by the tube contain only [2000]

1 a continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of 0.155 $Å$

2 a continuous X-ray spectrum (Bremsstrahlung) with all wavelengths

3 the characteristic X-ray spectrum of tungsten

4 a continuous X-ray spectrum (Bremsstrahlung) with a minimum wavelength of 0.155 $Å$ and the characteristic X-ray spectrum of tungsten.

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