Question

Long range transmission of TV signal is done by
A. Space wave
B. Skywave
C. Ground wave
D. Artificial satellite

Answer 1

Hint- The ground waves can allow only transmission up to $30\,MHz$ of signals. The sky waves can transmit $30MHz\,$ to $40MHz$. The Skywave uses the ionosphere reflection. TV signals cannot be reflected by the ionosphere. TV signal ranges from $30MHz\,$ to $300MHz$.Space waves use line of sight communication.

Complete step by step solution:
In long distance TV communication, we use satellites. A satellite is a small object which revolves around the earth. If communication happens between any two stations with the help of a satellite then that communication is called satellite communication.

Normally the communication is done using ground wave propagation or Sky wave propagation. Ground wave propagation can be used only for frequencies up to $30\,MHz$

Sky wave propagation can be used for the range $30MHz\,$ to $40MHz$. It uses the ionosphere to reflect the message signal.TV signals cannot be reflected by the ionosphere hence skyways cannot be used. TV signal ranges from $30MHz\,$ to $300MHz$.

Space wave communication uses line of sight communication. So, the signals are sent in a straight line from the transmitter to the receiver. At long distances we cannot use this because the transmitter and receiver cannot be in line of sight due to curvature of the earth.

But satellite communication can help us to overcome all these limitations. With the help of satellites, we can communicate over long distances which are beyond the line of sight.

Hence the correct answer is option C.

Note: The communication using ground wave propagation and the sky wave propagation is often limited. But satellite communication can overcome the limitation of distance by allowing the transmission of signals from stations which are at long distances from each other. The barrier that transmitter and receiver cannot be in line of sight because of the curvature of the earth when stations are at long distance is also overcome using satellite communication.