The process of the loss of strength of a signal while propagating through a medium is

If multiple waves with modulation indices $n_1, n_2, n_3, ...$ modulate a carrier wave,what is the total modulation index of the resulting wave?

In amplitude modulation,

The characteristic impedance of a coaxial cable is typically in the range of ..........

Broadcasting antennas are generally

$A$ signal $A \cos \omega t$ is transmitted using $v_0 \sin \omega_0 t$ as a carrier wave. The correct amplitude modulated $(AM)$ signal is: