JEE Main 2017 · 8 Apr · Shift 1 · Physics Q28

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A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.

Modulation index = 5, side frequency bands are at 1400 kHz and 1000 kHz

Modulation index = 5, side frequency bands are at 21.2 kHz and 18.8 kHz

Modulation index = 0.8, side frequency bands are at 1180 kHz and 1220 kHz

Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz

Answer and worked solution

Official answer: D

$m=\dfrac{5}{25}=0.2$ . Side bands are at $1200\pm20$ kHz: 1220 kHz and 1180 kHz.

Topics:Modulation

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JEE Main 2017 · 8 Apr · Shift 1, Physics question 28