Question

What is modulation? In the given block diagram of a receiver for detection of amplitude modulated waves, write the name of part X.

Answer 1

Hint: The important thing in the process which is shown in the diagram is that, after the Amplifier modulated the received wave signal, it has to be returned to its initial state so that further processing can be done using the initial waveform.

Complete step by step answer:
When the frequency, amplitude and other properties of a received periodic wave signal (also called carrier wave signal) is varied this process is called modulation. In other words, Modulation is a process when these properties like frequency and amplitude of a wave signal is superimposed into another wave signal called carrier wave.
The main purpose of modulation of a received wave signal before processing is that the wave signal has to travel a long distance after it is received for being processed, so in real life, wave can lose a lot of energy in this duration of it’s processing, therefore, we have to transmit it with some extra energy, that’s why we module it before processing. So that the wave signal should have appropriate properties for the further processing.
Another reason why modulation is used can be that an initial wave signal before the modulation process may not have enough frequency range hence they may be unable to travel a longer distance and duration of processing because of lower energies.
X in the block diagram is a demodulator.

Note: After the signal reached the destination, it is demodulated to extract original information from the amplified signal which the carrier wave was carrying. Signal is modulated so that it can travel through long distances between sender and receiver.