Question

In sky wave communication which of the frequency will be reflected back by the ionospheric layer having electron density $4\times {10}^6/m^3$ ?

• A. $18\times {10}^{3}Hz$
• B. $9\times {10}^{3}Hz$
• C. $31\times {10}^{3}Hz$
• D. $20\times {10}^{3}Hz$

Answer 1

The correct option is A $18\times {10}^{3}Hz$

Frequency is given by

$F=9(N{)}^{\frac{1}{2}}$

Where N is electron density

putting values

$F=18\ast {10}^3$