The " \( \mathrm{K}_{\alpha} \) " X-rays emission line of tungsten ...

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The " \( \mathrm{K}_{\alpha} \) " X-rays emission line of tungsten occurs at \( \lambda=0.021 \mathrm{~nm} \). The energy difference between \( \mathrm{K} \) and \( \mathrm{L} \) levels in this atom is about
(A) \( 0.51 \mathrm{MeV} \)
(B) \( 1.2 \mathrm{MeV} \)
(C) \( 59 \mathrm{keV} \)
(D) \( 13.6 \mathrm{eV} \)
\( \mathrm{P} \)
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