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An X-raytube is working at potential of...

An X-raytube is working at potential of 20 KV. The potential difference is decreased to 10 KV. It is found that the difference of the wavelength of `K_(alpha)` X-ray and the most energetic continuous X-ray becomes 4 times the difference before the change ofvoltage.Find the atomic number of the target element.
Take b=1 and `(1)/(sqrt(3.4))=0.54`

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