From which height does the ionosphere extends above the earth's sur...

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From which height does the ionosphere extends above the earth's surface?
(a) 65 to \( 75 \mathrm{~km} \)
(b) 170 to \( 190 \mathrm{~km} \)
(c) \( \sim 65 \mathrm{~km} \) to \( 400 \mathrm{~km} \)
(d) \( \sim 65 \) to \( \sim 75 \mathrm{~km} \)
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