Given data :
Ground station antenna is replaced by antenna of 12p dB gain.
We know that Intensity of a signal is the ratio of power and area as,
When we measure in decibal, then
I = Intensity at a distance D
= Intensity at a distance R
We know that, 120 dB gaingain antenna is installed then, putting in above data we can say that
Note that , Log is on base 10, so
the distance, D at which communication from the space craft will be lost again is
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