What is the modulation index of the $AM$ wave shown in the figure?

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

$A$ $TV$ transmitting antenna is $128 \ m$ tall. If the receiving antenna is at the ground level,the maximum distance between them for satisfactory communication in line-of-sight mode is (radius of the earth $R_e = 6.4 \times 10^6 \ m$):

The bandwidth of a coaxial cable is approximately ........ .

$A$ message signal of peak voltage $12 \ V$ is used to amplitude modulate a carrier signal of frequency $1.2 \ MHz$. The amplitude of the side bands is (in $V$)

If the amplitude of an audio signal is half the amplitude of the carrier wave,what is the modulation index?