Who developed the hot cathode ray tube?
A) W. D. Coolidge
B) A. Cieszynski
C) H. R. Raper
D) O. Walkhoff
A
Explanation: A) William David Coolidge developed the shockproof hot cathode tube while working for General Electric Company in 1913.
B) William David Coolidge developed the shockproof hot cathode tube while working for General Electric Company in 1913.
C) William David Coolidge developed the shockproof hot cathode tube while working for General Electric Company in 1913.
D) William David Coolidge developed the shockproof hot cathode tube while working for General Electric Company in 1913.
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