A carrier wave of peak voltage \( 18 \mathrm{~V} \) is used to transit a message signal. Calcula...

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A carrier wave of peak voltage \( 18 \mathrm{~V} \) is used to transit a message signal. Calculate the peak voltage of the modulating signal in order to have a modulation index of \( 50 \% \).
(a) \( 2 \mathrm{~V} \)
(b) \( 9 \mathrm{~V} \)
(c) \( 3 \mathrm{~V} \)
(d) \( 6 \mathrm{~V} \)
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