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(C) The minimum wavelength (cutoff wavelength) of $X$-rays is given by the formula: $\lambda_{\min} = \frac{hc}{eV}$,where $eV$ is the kinetic energy

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$K.E.$ of electrons striking the target is increased

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(C) The minimum wavelength (cutoff wavelength) of $X$-rays is given by the formula: $\lambda_{\min} = \frac{hc}{eV}$,where $eV$ is the kinetic energy $(K.E.)$ of the electrons striking the target.From this relation,we can see that $\lambda_{\min} \propto \frac{1}{K.E.}$.Therefore,when the kinetic energy $(K.E.)$ of the electrons striking the target is increased,the wavelength $\lambda_{\min}$ decreases.

The wavelength of $X$-rays decreases,when

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