In which decade were the first successful diode and triode vacuum tubes invented?
Options
A. 1800s
B. 1880s
C. 1890s
D. 1900s
Correct Answer
1900s
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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