Discussion
The earliest version of the cathode ray tube, using a cold-cathode diode, was invented by which German physicist?
Answer: A
It was Ferdinand Braun.
He built the first cathode ray tube in 1897, using a cold cathode and a fluorescent screen - the Braun tube. Every television and oscilloscope before the flat panel descended from it. He shared the 1909 Nobel Prize with Marconi.
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