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  4. The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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Q. The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of $V$ volts is directly proportional to

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Solution:

By the law of photo-electric effect $\frac{hc}{\lambda}=eV$
or $\lambda=\frac{hc}{eV} \propto \frac{1}{V}$