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The difficulty with reducing the accelerating voltage of a cathode ray tube to gain sensitivity is that

  • A.the trace becomes dim
  • B.the beam can no longer be focused to a fine point at the screen
  • C.the deflection plates begin to draw current from the signal source
  • D.the persistence of the phosphor becomes much shorter than before

Answer: A

The light output depends on the energy the electrons deliver to the phosphor, so a slower beam gives a fainter trace. Post-deflection acceleration resolves the conflict by accelerating the beam after it has been deflected rather than before.

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