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Find the maximum frequency, the X-ray em...

Find the maximum frequency, the X-ray emitted by an X-ray tube operating at `30 kV`

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`ev =hv`
`v=(e V)/(h) =(1.6xx10^(-19)xx 30xx10^(3))/(6.6 xx 10^(-34))`.
`=7.2 xx 10^(18)Hz`.
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