Q147 / 180 · AIIMS 2011 · Physics

Voltage of modulating wave of $5 \mathrm{~V}$ with $10 \mathrm{MHz}$ frequency was superimposed on carrier wave of frequency $20 \mathrm{MHz}$ and voltage $20 \mathrm{~V}$ then the modulation index is

Correct answer
A
0.25
B
1.25
C
2.43
D
64.0

Solution

Given, $A_m=5 \mathrm{~V}, A_c=20 \mathrm{~V}$ $\therefore$ Modulation index, $\mu=\frac{A_m}{A_c}=\frac{5}{20}=0.25$

Hence, the correct answer is option: 'A'.

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