Physics - Modern Physics Question with Solution | TestHub

In an X-ray tube the accelerating voltage is 20 kV. A target is used in the X-ray tube. The wavelength of the ${\mathrm{L}}_{\alpha }$ line is 124 pm. The wavelength of ${\mathrm{K}}_{\alpha }$ line is 54 pm. The energy of the 'target' ion with vacancy in ' M ' shell is 5.5 keV higher than the atom of target. Find the minimum wavelength (in $\mathring{A}$ ) of the characteristic X-ray that will be emitted by target. [Take $\mathrm{hc}=12400\mathrm{eV}\mathring{A}$ ]