For transmission of e.m. wave of audible frequency,these waves are superimposed with waves of

In $AM$ modulation,a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be $6\,V$ and $2\,V$ respectively. The modulation index is $\dots \%$.

If the height of the transmitting tower is increased by $30 \%$,then the area covered by it increases by (in $\%$)

$A$ transmitting antenna at the top of a tower has height $32\, m$ and the height of the receiving antenna is $50\, m$. What is the maximum distance between them for satisfactory communication in line of sight $(LOS)$ mode? ........$km$

The total power content of an $AM$ wave is $1500 \, W$. For $100 \%$ modulation,the power transmitted by the carrier is ........ $W$.

If the amplitude of the modulated wave and the amplitude of the signal are equal, then the modulation index is .....$\%$