The height of a $TV$ transmission tower is $240 \ m$. Up to what distance can the transmission be received (in $km$)? (Radius of the Earth $R = 6.4 \times 10^6 \ m$)

$AM$ (Amplitude Modulation) is used for broadcasting because...

For an amplitude modulated wave,the modulation index is found to be $0.5$. If the maximum amplitude is found to be $10.0 \ V$,then the minimum amplitude is: (in $V$)

The maximum amplitude of an $AM$ wave is $90 V$ and the minimum amplitude is $10 V$. What is the original amplitude of the carrier wave in the given $AM$ wave in $V$?

$A$ bandwidth of $6 \, \text{MHz}$ is available for $A.M.$ transmission. If the maximum audio signal frequency used for modulating the carrier wave is not to exceed $6 \, \text{kHz}$,the number of stations that can be broadcasted within this band simultaneously without interfering with each other will be ..... .

Radio waves that reach the receiver after being reflected from the ionosphere propagate via .......