Question

On a particular day, the maximum frequency reflected from the ionosphere is 9 MHz. On another day, it was found to increase by 1 MHz. What is the ratio of the maximum electron densities of the ionosphere on the two days?

• A. 1.23
• B. 1
• C. 1.43
• D. 0.75

Answer 1

Answer: (A)

1.23

Answer 2

$\frac{N' _{max}}{N _{max}} = \left(\frac{v'_{c}}{v _{c}}\right)^{2}$
$= \left(\frac{9+1}{9}\right)^{2} =\left(\frac{10}{9}\right)^{2 } = 1.23$