Calculation of frequency spectrum in AM wave

Q.  Calculate the frequencies available in the frequency spectrum when a 2MHz carrier is modulated by two sinusoidal signals of 350Hz and 600Hz.
- Published on 13 Oct 15

a. 2000.35, 1999.65 and 2000.6, 1999.4
b. 1999.35, 1999.65 and 2000.6, 2000.4
c. 2000.35, 2000.65 and 2000.6, 2000.4
d. 1999.35, 1999.65 and 1999.6, 1999.4

ANSWER: 2000.35, 1999.65 and 2000.6, 1999.4
 
The frequencies obtained in the spectrum after the amplitude modulation are
fc + fm and fc + fm

therefore,

the available frequencies after modulation by 0.350 KHz are
2000KHz + 0.350 KHz = 2000.35 and 2000KHz - 0.350 KHz = 1999.65

the available frequencies after modulation by 0.6 KHz are
2000KHz + 0 .6 KHz = 2000.6 and 2000KHz - 0.6 KHz = 1999.4

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