In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V of the following X-rays have the lowest wavelength :
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Question

In producing X-rays a beam of electrons accelerated by a potential difference V is made to strike a metal target. For what value of V of the following X-rays have the lowest wavelength :

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: 40 kV.