MCQOPTIONS
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| 1. |
In earth's atmosphere, for \[{{F}_{2}}\] -layer, the virtual height and critical frequency in night time are |
| A. | \[210\,km\] and \[5\text{ }MHz\] |
| B. | \[250\,km\] and \[6\,MHz\] |
| C. | \[280\text{ }km\] and \[7\text{ }MHz\] |
| D. | \[350\,km\] and \[6\,MHz\] |
| Answer» E. | |