The process of superimposing a signal frequency (i.e.,audio wave) on a carrier wave is known as:

The height of a transmission antenna is $100 \, m$. The population density is $1000 \, \text{people}/km^2$. How many people can watch the program?

Three signals related to amplitude modulation are shown in the figure. The correct assignment of the signals is

Audio signals cannot be transmitted directly over long distances because:

$A$ wave is represented as $e = 10\,(1 + 6\, \sin(50t)) \sin(10^8t)$. The modulation index is:

In amplitude modulation,the amplitude of the $.......$ wave varies in proportion to the instantaneous value of the $.......$ wave.