1. A – ground wave, B – space wave, and C – sky wave.
2. TV signals are in the range of 100 to 220 MHz. Ionosphere cannot reflect these waves.
3. Wave length corresponding to 100 MHz is
\(λ=\frac{c}{f}=\frac{3\times10^8}{7.5\times10^6}\) = 40 m
Wavelength corresponding to 220 MHz is
\(λ=\frac{c}{f}=\frac{3\times10^8}{12\times10^6}\) = 25 m
the wavelength band is 25 m to 40 m.