A) Modulation index = 5, side frequency bands are at 1400 kHz and 1000 kHz
B) Modulation index = 0.8, side frequency bands are at 1180 kHz and 1220 kHz
C) Modulation index = 0.2, side frequency bands are at 1200 kHz and 1180 kHz
D) Modulation index = 5, side frequency bands are at 21/2 kHz and 18.8 kHz
Correct Answer: C
Solution :
Modulation \[idex=m=\frac{{{V}_{m}}}{{{V}_{0}}}\] \[=\frac{1}{5}=0.2\] Frequency \[=12\times {{10}^{3}}kHz\] F = 12.00 kHz \[{{\text{F}}_{\text{1}}}\] = 1200 - 20 = 1180 kHz \[{{\text{F}}_{2}}\] = 1200 + 20 = 1220 kHz
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