Q.

The difference between phase and frequency modulation 

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a

 lies in the poorer audio response of phase modulation

b

lies in the definitions of modulation and their modulation index

c

lies in the poorer audio response of frequency modulation

d

practically they are same but theoretically they differ

answer is A.

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Detailed Solution

Frequency modulation (FM) and Phase modulation(PM) have much in common . It is impossible to tell them apart without knowledge about the  function

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