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12th Physics 2018 Set1 Delhi Board Paper Solution

Question 10

A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%.

Answer

It is given that peak voltage of carrier wave, Ac = 15V

and, Modulation index,  mu = 60% = 60/100 

Then, peak voltage of the modulating signal (Am) will be given by relation,

            mu           =    Am/Ac

           60/100      =    Am/15V

           Am            =   60/100  x 15V

           Am              =   9V

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