Question

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are ______. 

Options

• 2005 kHz, 2000 kHz and 1995 kHz

• 2000 kHz and 1995 kHz

• 2 MHz only

• 2005 kHz and 1995 kHz

Answer 1

A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal are 2005 kHz, 2000 kHz and 1995 kHz.

Explanation:

Amplitude modulated wave consists of three frequencies are ω_c + ω_m, ω, ω_c - ω_m

i.e. 2005 kHz, 2000 kHz and 1995 kHz.