A speech signal of `3 kHz` is used to modulate a carrier signal of frequency `1 MHz`, using amplitude modulation. The frequencies of the side bands will be

Options

A. 1.003 MHz and 0.997 MHz
B. 3001 KHz and 2997 KHz
C. 1003 KHz and 1000 KHz
D. 1MHz and 0.997MHz

Answer

A

Explanation

Here, `v_(c)=1MHz, v_(c)=3kHz=0.003` MHz
The frequencies of the side bands.
` =(v_(c)+v_(m))` and `(v_(c)-v_(m))=(1+0.003)` and `(1-0.003)`
=1.003 MHz and 0.997 MHz.