The intensity of X-rays from a Coolidge tube | vedclass

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(A) The wavelength of the characteristic $X$-ray line,such as the ${K_\alpha }$ line $({\lambda _k})$,depends only on the material of the target and i

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$({\lambda _K} - {\lambda _C})$ increases

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(A) The wavelength of the characteristic $X$-ray line,such as the ${K_\alpha }$ line $({\lambda _k})$,depends only on the material of the target and is independent of the accelerating voltage $(V)$.The minimum wavelength of the continuous $X$-ray spectrum $({\lambda _c})$ is given by the Duane-Hunt law: ${\lambda _c} = \frac{hc}{eV}$.From this relation,it is clear that ${\lambda _c}$ is inversely proportional to the accelerating voltage $(V)$.As the accelerating voltage $(V)$ is increased,${\lambda _c}$ decreases,while ${\lambda _k}$ remains constant.Therefore,the difference $({\lambda _K} - {\lambda _C})$ will increase.

The intensity of $X$-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is ${\lambda _c}$ and the wavelength of the ${K_\alpha }$ line is ${\lambda _k}$. As the accelerating voltage is increased:

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