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When the voltage applied to an X-ray tub...

When the voltage applied to an X-ray tube increased from `V_(1)=15.5kV` to `V_(2)=31kV` the wavelength interval between the `K_(alpha)` line and the cut-off wavelength of te continuous X-ray spectrum increases by a factor of `1.3`. If te atomic number of the element of the target is z. Then the value of `(z)/(13)` will be: (take `hc=1240eVnm` and `R=1xx(10^(7))/(m))`

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