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This question belongs to General Knowledge Inventions

Inventions

?

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

A) 1800s B) 1880s C) 1890s D) 1900s

Answer & Solution

Correct Answer: Option D

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.

Question posted by Examveda

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