If the wavelenth of K α radiation emitted by an atom of atomic number Z = 41 is λ , then the atomic number for an atom that emits K α radiation with wavelength 4 λ , is

Question

If the wavelenth of K α radiation emitted by an atom of atomic number Z = 41 is λ , then the atomic number for an atom that emits K α radiation with wavelength 4 λ , is, 21, 28, 11, 36

MARKS App · Accepted Answer

1 λ ∝ Z -1 2 ∴ λ 1 λ 2 = Z 2 - 1 2 Z 1 - 1 2 1 4 = Z 2 - 1 41 - 1 2 1 2 = Z 2 - 1 40 Solving this, we get, Z 2 = 21

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