For F1 layer the maximum ionic density is 2.3 x 104 electrons per cc. The critical frequency for this layer will be
Given,
Maximum ionic density (Nmax)=2.3×104/cc(N_{max})=2.3\times 10^{4} /cc(Nmax)=2.3×104/cc
Critical frequency (fc)=9Nmax(fc)=9\sqrt{N_{max}}(fc)=9Nmax
Now, substituting the values,
fc=92.3×104×106f_c=9\sqrt{2.3\times 10^{4}\times 10^{6}}fc=92.3×104×106
⇒fc=9×1.51×102×103\Rightarrow f_c=9\times 1.51\times 10^2\times 10^3⇒fc=9×1.51×102×103 Hz
⇒fc=13.6×105Hz\Rightarrow f_c=13.6\times 10^5Hz⇒fc=13.6×105Hz
⇒fc=1.36MHz\Rightarrow f_c=1.36MHz⇒fc=1.36MHz
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