Question
Physics Question on communication systems
For signal transmission, modulation is necessary
A
To reduce distortion of the signal
B
To modify the frequency content of the signal
C
To mask the signal information from enemy
D
To radiate the signal to a large distance using antennas
Answer
To radiate the signal to a large distance using antennas
Explanation
Solution
Whenever a message signal is transmitted over a large distance, then it has the tendency to lose some of the information. However, in order to prevent this, carrier signals are being added to the message signal using antennas which is known as modulation.
Thus, this process of modulation is necessary to radiate the signal to a large distance using antennas.