Question

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

• A. 1.21
• B. 0.82
• C. 0.50
• D. 0.25

Answer 1

Answer: (A)

1.21

Answer 2

: $\upsilon_{c} = 9\sqrt{N_{\max}}$

$N_{\max} = \frac{\upsilon_{c}^{2}}{81} \propto \upsilon_{c}^{2}$

$\Rightarrow \frac{(N_{2})_{\max}}{(N_{1})_{\max} = \left( \frac{11}{10} \right)^{2} = \frac{121}{100} = 1.21}$