If a receiving station on the ground is receiving a frequency of $10 \text{ MHz}$, the mode of propagation is...

What is the minimum height of an antenna required to transmit a radio signal of frequency $20 \text{ MHz}$?

Space wave propagation is possible for which frequency range?

The carrier frequency of a transmitter is provided by a tank circuit of a coil of inductance $49\,\mu H$ and a capacitance of $2.5\,nF$. It is modulated by an audio signal of $12\,kHz$. The frequency range occupied by the side bands is

If the range of a $TV$ telecast is to be doubled,the height of the transmitting antenna must be:

Given below are two statements
Statement $I:$ For transmitting a signal,the size of the antenna $(l)$ should be comparable to the wavelength of the signal (at least $l = \frac{\lambda}{4}$ in dimension).
Statement $II:$ In amplitude modulation,the amplitude of the carrier wave remains constant (unchanged).
In the light of the above statements,choose the most appropriate answer from the options given below.