Question

The amplitude of $15 \sin (1000 \pi t )$ is modulated by $10 \sin (4 \pi t )$ signal The amplitude modulated signal contains frequency (ies) of A $500\,Hz$ B $2\, Hz$ C $250\, Hz$ D $498\, Hz$ E $502\, Hz$ Choose the correct answer from the options given below:

• A. B Only
• B. A and B Only
• C. A, D and E Only
• D. A Only

Answer 1

Answer: (C)

A, D and E Only

Answer 2

Carrier wave frequency
VC​=2π100π​=500Hz
Modulating wave frequency
Vm​=2π4π​=2Hz
∴VC​−Vm​,Vc​,Vc​+Vm​
=498Hz,500Hz,502Hz