Question

A message signal of frequency $5 \,kHz$ is used to modulate a carrier signal of frequency $2\, MHz$ The bandwidth for amplitude modulation is:

• A. $10 \,kHz$
• B. $2.5 \,kHz$
• C. $20\, kHz$
• D. $5\, kHz$

Answer 1

Answer: (A)

$10 \,kHz$

Answer 2

Given
Signal frequency fm​=5kHz
Carrier wave frequency fc​=2MHz
fc​=2000KHz
The resultant signal will have band width of frequency given by
[(fc​+fm​)−(fc​−fm​)]
⇒[(2000+5)−(2000−5)]kHz
⇒10kHz