\( \mathrm{K}_{\alpha} \) wavelength emitted by an atom \( \lambda ...

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\( \mathrm{K}_{\alpha} \) wavelength emitted by an atom \( \lambda \) is given by an atom of atomic number \( Z=11 \) is \( \lambda \). Find the atomic number for an atom that emits \( \mathrm{K}_{\alpha} \) radiation with wavelength \( 4 \lambda \).
(a) \( \mathrm{Z}=6 \)
(b) \( \mathrm{Z}=4 \)
(c) \( \mathrm{Z}=11 \)
(d) \( \mathrm{Z}=44 \)
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