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