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In commercial electron tubes the current produced by the cathode at 1000 K is about | |
A. | 0.01 A per cm2 of cathode surface [Wrong Answer] |
B. | 0.1 A per cm2 of cathode surface [Correct Answer] |
C. | 1 A per cm2 of cathode surface [Wrong Answer] |
D. | 5 A per cm2 of cathode surface [Wrong Answer] |