Question

For a regular layer, the critical frequency is proportional to the ______ of electron density.

(a) Square

(b) Inverse

(c) Square root

(d) Inverse square root

This question was posed to me in an online quiz.

This intriguing question originated from Critical Frequency topic in division Virtual Height, Critical Frequency and Muf of Antennas

Answer 1

Correct answer is (c) Square root

To elaborate: For a regular layer, the critical frequency is proportional to the square root of  Nmax electron density. \(f_c=9\sqrt{N \,max} \)