Question

For F₁ layer the maximum ionic density is 2.3 x 10⁴ electrons per cc. The critical frequency for this layer will be

Answer 1

Given,

Maximum ionic density $(N_{max})=2.3\times 10^{4} /cc$

Critical frequency $(fc)=9\sqrt{N_{max}}$

Now, substituting the values,

$f_c=9\sqrt{2.3\times 10^{4}\times 10^{6}}$

$\Rightarrow f_c=9\times 1.51\times 10^2\times 10^3$ Hz

$\Rightarrow f_c=13.6\times 10^5Hz$

$\Rightarrow f_c=1.36MHz$