A single of frequency 20 kHz and peak voltage of 5 Vlt 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.

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

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

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

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Solution

The correct option is D Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz.
Modulate Index:
$\frac{5}{25} = \frac{1}{5} = 0.2$

Side frequency
$(1200 + 20) H z$ = $1220 k H z$
and $1200 - 20 = 1180 k H z$

Hence correct answer is D.

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

The correct option is D Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz.Modulate Index:525=15=0.2Side frequency (1200+20)Hz=1220kHzand 1200−20=1180kHzHence correct answer is D.

The correct option is D Modulation index = 0.2, side frequency bands are at 1220 kHz and 1180 kHz.
Modulate Index:
$\frac{5}{25} = \frac{1}{5} = 0.2$

Side frequency
$(1200 + 20) H z$ = $1220 k H z$
and $1200 - 20 = 1180 k H z$

Hence correct answer is D.