TS EAMCET · Physics · Communication System
A message signal of \(12 \mathrm{kHz}\) and peak voltage \(20 \mathrm{~V}\) is used to modulate a carrier wave frequency \(12 \mathrm{MHz}\) and peak voltage \(30 \mathrm{~V}\). Then, the modulation index is
- A 0.32
- B 6.7
- C 0.67
- D 67
Answer & Solution
Correct Answer
(C) 0.67
Step-by-step Solution
Detailed explanation
Given, message signal peak voltage \(=20 \mathrm{~V}\) \(\therefore \quad E_m=20 \mathrm{~V}\) Carrier voltage, \(E_c=30\) volt Thus, modulation index, \(m_{\mathrm{a}}=\frac{E_m}{E_c}=\frac{20}{30}=\frac{2}{3}=0.67\)
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