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When the voltage applied to an \( \ddot{\mathrm{X}} \)-ray tube is increased from \( V_{1}=10 \mathrm{kr} \) to \( V_{2}=20 \mathrm{kV} \), the wavelength difference between the \( K_{\alpha} \) line and the short wavelength limit of the continuous
\( \mathrm{P} \) X-ray spectrum increases by a factor 3 . The atomic number of the target element is :
(a) 82
(b) 56
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(c) 45
(d) 29
(d) 29
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