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Questions  >>  CBSE XII  >>  Physics  >>  Communication systems
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The correct radiation between plasma frequency $\nu$ of a radio wave length and electron density N of the ionosphere

$\begin{array}{1 1} \nu = 10^9\;N \\\nu = 9\;N \\ \nu =9 \sqrt{N} \\ N= 9 \sqrt {\nu}\end{array} $

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