Which frequency range is allocated for commercial $FM$ radio broadcasting?

The figure shows the waveform of an amplitude modulated wave. Its modulation factor is

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 modulation index $\mu = \frac{1}{2}$ and $V_{m} = 2$,then $V_{c} = \, ?$

Communication on ground is through electromagnetic waves of wavelength

Audio signals cannot be transmitted directly because $.......$