General Knowledge - Technology - Discussion

31. 

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

[A]. 1800s
[B]. 1880s
[C]. 1890s
[D]. 1900s

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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