The size of the antenna required for a carrier wave of frequency $3 \text{ MHz}$ is: (in $\text{ m}$)

For television broadcasting,the frequency employed is normally in the range of,

$A$ carrier signal of frequency $v_1$ and peak voltage of $V_1$ is modulated by a message signal of frequency $v_2$ and peak voltage of $V_2$. Let $m$ be the modulation index and $v_{+}, v_{-}$ be side bands produced. The correct statement is

For sky wave propagation of a $10\, MHz$ signal, what should be the minimum electron density in the ionosphere?

Which types of communication modes are used for the propagation of radio waves from one place to another?

The total power in an $AM$ wave is $1500 \ W$. What is the power transmitted by the carrier for $100\%$ modulation (in $W$)?