# 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% - Physics

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%

#### Solution

The amplitude of the carrier wave, Ac = 15 V

Modulation index, m = 60% = 0.60

Amplitude of the modulating wave = Am

Using the relation for modulation index:

m = A_m/A_c

:. A_m = mA_c

= 0.60 xx 15 = 9 V

Concept: Modulation and Its Necessity
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