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An X-ray tube is operated at a constant ...

An X-ray tube is operated at a constant potential difference and it is required to get X-rays of wavelength not less than `0.2` nanometres.Then the potential difference in kilovolts is : "(h=6.63times10^(-34)J-s,e=1.6times10^(-19)" coulomb, "c=3times10^(8)m/s)"

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