The wavelength of ${K_\alpha }$ line for an element of atomic number $29$ is $\lambda $ . Then the wavelength of ${K_\alpha }$ line for an element of atomic no $15$ is (Take mosley‘s constant $b = 1$ for both elements)

  • A

    $\frac{{29}}{{15}}\lambda $

  • B

    $\frac{{28}}{{15}}\lambda $

  • C

    $4\lambda $

  • D

    $2\lambda $

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