Question

On a particular day, the maximum frequency reflected from the ionosphere is $10\text{MHz}$. On another day, it was found to increase to $11\text{MHz}$. Calculate the ratio of maximum electron density of the ionosphere on the two days.

• A. $1.21$
• B. $1.44$
• C. $0.88$
• D. $1.69$

Answer 1

The correct option is A $1.21$

$f_c=9\sqrt{N_{max}}$
where, $N_{max}=$ electron charge density
$N_{max}=\frac{f_c^2}{81}$
here, $N_{max}\propto f_c^2$
$\frac{N_{ma{x}_2}}{N_{ma{x}_1}}=\frac{f_{c2}^2}{f_{c1}^2}=[\frac{11}{10}{]}^2=1.21$