In an X-ray experiment, the target is copper (Z = 29) with an impurity. The Kα wavelength of copper is λ₀, while the impurity Kα wavelength is (784/625)λ₀. Find the atomic number of the impurity.
Options

Question

In an X-ray experiment, the target is copper (Z = 29) with an impurity. The Kα wavelength of copper is λ₀, while the impurity Kα wavelength is (784/625)λ₀. Find the atomic number of the impurity.

Options

G1 Physics · Accepted Answer

Step 1: For continuous X-rays use the Duane-Hunt relation λₘᵢₙ = hc/(eV). Step 2: For characteristic lines use the difference of shell binding energies or Moseley's law √ν ∝ (Z − b). Using the stated data gives D: 26.