Physics - EM Waves Question with Solution | TestHub

For an amplitude modulated (AM) wave, the total bandwidth required is twice the highest modulating frequency. The given modulating frequencies are $f_1=5$ kHz, $f_2=8$ kHz, and $f_3=12$ kHz. The highest modulating frequency is $f_{m,max}=12$ kHz. Therefore, the total bandwidth (BW) is $BW=2\times f_{m,max}=2\times 12\text{ kHz}=24\text{ kHz}$.