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Which of the following devices uses thermionic emission?
  • a)
    Cathode ray tube
  • b)
    Light-emitting diode
  • c)
    Solar cell
  • d)
    X-ray machine
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Which of the following devices uses thermionic emission?a)Cathode ray ...
Cathode ray tubes use thermionic emission to generate electrons for producing a beam of electrons.
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Which of the following devices uses thermionic emission?a)Cathode ray tubeb)Light-emitting diodec)Solar celld)X-ray machineCorrect answer is option 'A'. Can you explain this answer?
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