In a signal reflection from the ionosphere, the sky \( \mathrm{P} \...

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In a signal reflection from the ionosphere, the sky
\( \mathrm{P} \) waves cover a distance on ground not more than

W.
(1) \( 400 \mathrm{~m} \)
(2) \( 4000 \mathrm{~m} \)
(3) \( 400 \mathrm{~km} \)
(4) \( 4000 \mathrm{~km} \)
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