The loss of strength of a signal while propagating through a medium is known as

Basically,the product modulator is

In communication with the help of an antenna,if the height is doubled,then the range covered,which was initially $r$,would become:

$A$ signal of $20 kHz$ is being carried on a carrier wave of $3 MHz$. What are the side-band frequencies?

Which characteristic of a carrier light wave is modulated for the modulation of a light wave?

$A$ basic communication system consists of:
$(a)$ Transmitter
$(b)$ Information source
$(c)$ User of information
$(d)$ Channel
$(e)$ Receiver
The correct sequence of the arrangement is: