Question

On which of the following the refractivity depends on?

(a) Air pressure

(b) Water pressure

(c) Temperature

(d) Air pressure, water pressure and temperature

I have been asked this question in examination.

This intriguing question originated from Space Wave Propagation topic in division Space Wave Propagation of Antennas

Answer 1

Right choice is (d) Air pressure, water pressure and temperature

Easy explanation: The expression used to calculate refractivity is given by

\(N=\frac{77.6}{T} P+4810 \frac{e}{T}\)

Where p is the total pressure in millibars, e is the partial pressure of water vapor and T is the absolute temperature.