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The maximum electron density of a layer of the ionosphere is 9 × 1012m–3. The critical frequency of this layer is 

(A) 9 MHz 

(B) 6 MHz 

(C) 27 MHz 

(D) 3 GHz

1 Answer

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Best answer

The correct option is (C) 27 MHz.

Explanation:

 Nmax = 9 × 1012m–3

 feritical = 9 √(Nmax)

= 9 × (9 × 1012)

= 9 × 3 × 106

= 27 MHz

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