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PRACTICE / Characteristic and continuous X-ray spectra

Read the energy limit from an edge

An ideal X-ray tube spectrum has a short-wavelength cutoff at 0.0500 nm. Incident electrons start with negligible kinetic energy. Use hc = 1.240 keV nm.

What accelerating voltage produced this cutoff?

Organize the givens & assumptions
  • λmin = 0.0500 nm
  • hc = 1.240 keV nm

Single-electron energy bound; ignore initial electron energy and voltage ripple.

  1. A24.8 V24.8\ \mathrm{V}
  2. B24.8 kV24.8\ \mathrm{kV}
  3. C2.48 kV2.48\ \mathrm{kV}
  4. D49.6 kV49.6\ \mathrm{kV}

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