# 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%? - Physics

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

Amplitude of the carrier wave, Ac = 12 V

Modulation index, m = 75% = 0.75

Amplitude of the modulating wave = Am

Using the relation for modulation index:

m = A_m/A_c

:. A_m = mA_c

= 0.75 xx 12 = 9 V

Concept: Modulation and Its Necessity
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#### APPEARS IN

NCERT Class 12 Physics Textbook
Chapter 15 Communication Systems
Exercise | Q 5 | Page 530

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