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1. |
An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10-5 ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is |
A. | 34% |
B. | 55.5% |
C. | 68.8% |
D. | 84.7% |
Answer» E. | |