In a signal reflection from the ionosphere, the sky waves cover a distance on ground not more th....

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In a signal reflection from the ionosphere, the sky waves cover a distance on ground not more than
\( \mathrm{P} \)
(1) \( 400 \mathrm{~m} \)
(2) \( 4000 \mathrm{~m} \)
W
(3) \( 400 \mathrm{~km} \)
(4) \( 4000 \mathrm{~km} \)


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