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Persistence of a cathode ray tube screen refers to

  • A.the time the phosphor continues to glow after the beam has passed
  • B.the length of time the tube remains serviceable before the phosphor is burned
  • C.the delay between the beam being deflected and the spot appearing on the screen
  • D.the ability of the tube to retain a trace when the supply is switched off

Answer: A

A long persistence phosphor holds a trace for a second or more, which suits slow phenomena that would otherwise appear as a moving dot. A short persistence suits fast repetitive signals, where a lingering trace would smear the display.

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