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.


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