TS EAMCET · Physics · Communication System
A carrier wave of peak voltage \(10 \mathrm{~V}\) is used to transmit a message signal. What should be the peak voltage of the modulatingsignalinordertohaveamodulationindex of \(80 \%\)
- A \(8 \mathrm{~V}\)
- B \(8.8 \mathrm{~V}\)
- C \(5 \mathrm{~V}\)
- D \(12.5 \mathrm{~V}\)
Answer & Solution
Correct Answer
(A) \(8 \mathrm{~V}\)
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \mathrm{m}=\frac{\mathrm{A}_{\mathrm{m}}}{\mathrm{A}_{\mathrm{c}}} \Rightarrow 0.8=\frac{\mathrm{A}_{\mathrm{m}}}{10} \\ & \Rightarrow \quad \mathrm{A}_{\mathrm{m}}=8 \mathrm{~V}\end{aligned}\)
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