Multiple choice

The first thermionic valve was invented by

  1. Thomas Edison

  2. Richardson

  3. J. A. Fleming

  4. Douglas Dewar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sir John Ambrose Fleming  (29 November 1849 – 18 April 1945) was a British electrical engineer and physicist. He is known for inventing the first thermionic valve or vacuum tube.

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