Question

In sky-wave propagation, skip-distance depends on

• A. frequency of e.m. waves transmitted.
• B. critical frequency of the layer.
• C. height of layer above the Earth's surface.
• D. all of the above.

Answer 1

Answer: (D)

all of the above.

Skip distance is the minimum distance on Earth's surface from the transmitter where e.m. wave of a definite frequency can reach after reflection from the ionosphere.
It is given by $D_{skip}=2h\sqrt{\frac{f^2}{{f_c}^2}-1}$
$⟹D_{skip}$ is dependent on $h$, $f$ and $f_c$.