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  1. In which decade were the first successful diode and triode vacuum tubes invented?

  2. A.

     1800s

    B.

     1880s

    C.

     1890s

    D.

     1900s

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    Answer : Option D

    Explanation :

    In 1904, John Ambrose Fleming invented the first practical electron tube called the 'Fleming Valve', which is a diode rectifier. In 1906, Lee de Forest invented the audion later called the triode, which provided signal amplification.


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