(a) Define the term 'modulation index,' used in communication system. Why is

     its value kept less than or equal to one ?

(b) A message signal of frequency 10 kHz and peak voltage of 10V is used to

      modelate a carrier frequency 1 MHz and peak voltage 10 V. Determine the

      (i) modulation index, and 

      (ii) side bands produced.

                                                                                                      3 marks

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