Kα wavelength emitted by an atom of atomic number Z = 11 is λ,. Find the atomic number for an atom that emits Kα-radiation with wavelength 4λ.

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answer is 6.

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Detailed Solution

f1=vλ1=a(11−1) and f2=vλ2=a(Z−1) By dividing, λ2λ1=10Z−1⇒41=10Z−1⇒Z=6

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