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Questions  >>  JEEMAIN and NEET  >>  Physics  >>  Class12  >>  Communication Systems
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Q)

Critical frequency $\nu_c$ for ionsphere is

$\begin{array}{1 1}(a)\;9N_{max}\\(b)\; 9\sqrt{N_{max}}\\(c)\;3\sqrt{N_{max}}\\(d)\;6N_{max}\end{array}$

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