MCQOPTIONS
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| 1. |
Suppose a ray is incident normally in the ionosphere region with electron density 25 1010/cm3, then the Maximum usable frequency is _____ |
| A. | 5GHz |
| B. | 45MHz |
| C. | 4.5MHz |
| D. | 125GHz |
| Answer» D. 125GHz | |