When the voltage applied to an X-ray tube increased from V_(1) =10 KV to V_(2)=20 KV, the wavelength interval between the K_(a)-line and the short wavelength cut-off of the continuous X-ray spectrum increases by a factor of 3. Find the atomic number of the element of the target.

When the voltage applied to an X-ray tube increased from V_(1) =10 KV

1.	When the voltage applied to an X-ray tube increased from V_(1) =10 KV to V_(2)=20 KV, the wavelength interval between the K_(a)-line and the short wavelength cut-off of the continuous X-ray spectrum increases by a factor of 3. Find the atomic number of the element of the target.
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When the voltage applied to an X-ray tube increased from V_(1) =10 KV to V_(2)=20 KV, the wavelength interval between the K_(a)-line and the short wavelength cut-off of the continuous X-ray spectrum increases by a factor of 3. Find the atomic number of the element of the target.

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