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Wave Optics
Question
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A block diagram of a receiver is as shown

Identify X and Y State their function.

Answer

X is the intermediate frequency(IF) stage.
Y is amplifier. 

Function:

Intermediate frequency stage is to change carrier frequency to a (standard) lower frequency function.

The detected signal is not strong enough to be bought in use and hence is fed into the amplifier to further amplify the signal. 

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