The bandwidth of a video signal is approximately ........

In amplitude modulation,if a message signal of $5 \ kHz$ is modulated by a carrier wave of frequency $900 \ kHz$,then the frequencies of the side bands are

Consider telecommunication using optical fibers. Which of the following statements is $NOT$ true?

The height of the transmitting antenna,if $TV$ programs have to cover a population in an area of radius $64 \ km$,is: [Use Radius of earth $= 6.4 \times 10^6 \ m$] (in $m$)

$A$ carrier is simultaneously modulated by two sine waves with modulation indices of $0.3$ and $0.4$; then the total modulation index is

$A$ message signal of frequency $8 \text{ kHz}$ and peak voltage $12 \text{ V}$ is used to modulate a carrier of frequency $1.2 \text{ MHz}$ and peak voltage $20 \text{ V}$. The modulation index is