The characteristic $X-$ray radiation is emitted,when

  • A
    The electrons are accelerated to a fixed energy
  • B
    The source of electrons emits a monoenergetic beam
  • C
    The bombarding electrons knock out electrons from the inner shell of the target atoms and one of the outer electrons falls into this vacancy
  • D
    The valence electrons in the target atoms are removed as a result of the collision

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