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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

Options

  1. A21
  2. B28
  3. C11
  4. D36

Correct answer

A. 21

Step-by-step solution

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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