Question

On a particular day, the maximum frequency reflected from the ionosphere is 10MHz. The maximum electron density in ionosphere is

Answer 1

Explanation :

The maximum frequency reflected from the ionosphere, $\f_c=10\ MHz=10\times 10^6\ Hz=10^7\ Hz$

The relation between electron density of ionosphere and the frequency is :

$f_c=9\sqrt{N_{max}}$

where,

$N_{max}$ is the maximum electron density in ionosphere.

$f_c$ is the critical frequency.

$N_{max}=\dfrac{f_c^2}{(9)^2}$

$N_{max}=\dfrac{(10^7\ Hz)^2}{(9)^2}$

$N_{max}=\dfrac{10^{14}}{81}$

$N_{max}=0.012\times10^{14}/m^3$

Hence, this is the required solution.