An element of atomic number 9 emits \( \mathrm{K}_{\alpha} \) X-ray of wavelength \( \lambda \).....

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An element of atomic number 9 emits \( \mathrm{K}_{\alpha} \) X-ray of
\( \mathrm{P} \)
wavelength \( \lambda \). Find the atomic number of the
W
element which emits \( \mathrm{K}_{\alpha} \) X-ray of wavelength \( 4 \lambda \).


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