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NCERT Class XII Chapter
Communication Systems
Questions With Solutions

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Question : 5 of 8
Marks: +1, -0
A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?
Solution:  
Modulation index, µ = AmAc\frac{A_m}{A_c}
So, peak voltage
AmA_m = μAc\mu A_c = 0.75 × 12 = 9 V
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