The wavelength of the \( \mathrm{K}_{\alpha} \) line for an element...

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The wavelength of the \( \mathrm{K}_{\alpha} \) line for an element of atomic number 57 is \( \alpha \). What is the wavelength of the \( \mathrm{K}_{\alpha} \) line for the element of atomic number 29 ?
\( \mathrm{P} \)
(A) \( \alpha \)
(B) \( 2 \alpha \)
(C) \( 4 \alpha \)
(D) \( 8 \alpha \)
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