The energy of a K-electron in tungsten is -20 keV and of an L-electrons is -2 keV. The wave length of X-rays emitted when there is electron jump from L to K shell :
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The energy of a K-electron in tungsten is −20 keV and of an L-electrons is −2 keV. The wave length of X-rays emitted when there is electron jump from L to K shell :

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 B: 0.6887 Å.