Question

The service area of space wave communication increases by
A. Increasing the height of the transmitting antenna.
B. decreasing the height of the receiving antenna.
C. increasing the height of both transmitting and receiving antenna.
D. decreasing the distance between transmitting and receiving antenna.

Answer 1

Hint
We know that the wave propagation is any of the ways in which waves travel. With respect to the direction of the oscillation relative to the propagation direction, we can distinguish between longitudinal waves and transverse waves. For electromagnetic waves, propagation may occur in a vacuum as well as in a material medium. Electromagnetic Waves also called Electromagnetic Radiations are basically defined as superimposed oscillations of an Electric and a Magnetic Field in space with their direction of propagation perpendicular to both of them. For mechanical waves such as sound waves, rope waves, ripple, etc require medium in order to propagate because the mechanism of wave propagation is through molecules or atoms distortion or disturbance. The closer the molecules, the faster the wave propagation. Based on this it is required to solve the answer.

Complete step by step answer
We know that the maximum range of space wave propagation is given by:
 $ \mathrm{d}=\dfrac{4}{3} \times 1.23\left[\sqrt{\mathrm{H}_{\mathrm{t}}}+\sqrt{\mathrm{H}_{\mathrm{r}}}\right] $
So, after the evaluation we can write that:
 $ \Rightarrow \text{d} \propto \sqrt{{{\text{H}}_{\text{t}}}} $
Thus, there is a conclusion from the above expression, which is:
 $ \therefore \mathrm{d} $ increases, if $ \mathrm{H}_{\mathrm{t}} $ and $ \mathrm{H}_{\mathrm{r}} $ , that is height of transmitting and receiving antenna increases.
Hence, we can say that the service area of space wave communication increases by increasing the height of both transmitting and receiving antenna.

So, the correct answer is option (C).

Note
We know that a device for reception of radiofrequency or RF. A receiving antenna performs the reverse of the process performed by the transmission antenna. It receives radiofrequency radiation and converts it into electric currents in an electric circuit connected to the antenna. The antenna at the transmitter generates the radio wave. A voltage at the desired frequency is applied to the antenna. The voltage across the antenna elements and the current through them create the electric and magnetic waves, respectively. Thus, the antenna becomes the signal source for the receiver input. A radio receiver is connected to an antenna which converts some of the energy from the incoming radio wave into a tiny radio frequency AC voltage which is applied to the receiver's input. An antenna typically consists of an arrangement of metal conductors.