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A beam of electrons striking a copper target produces X-rays. Its spectrum is as shown. Keeping the voltage same if the copper target is replaced with a different metal, the cut-off wavelength and characteristic lines of the new spectrum will change in comparison with old as

Options

  1. ACut-off wavelength will remain unchanged while characteristic lines will be different
  2. BBoth cut-off wavelength and characteristic lines will remain unchanged
  3. CBoth cut-off wavelength and characteristic lines will be different
  4. DCut-off wavelength will be different while characteristic lines will remain unchanged

Correct answer

A. Cut-off wavelength will remain unchanged while characteristic lines will be different

Step-by-step solution

Cut- off wavelength of emitted X-rays depends on maximum kinetic energy of incident electrons on the target and is independent of nature of target. The characteristic lines depend on nature of material of target.

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