A) Ground wave propagation can be sustained at frequencies 500 kHz to 1,500 kHz
B) Statellite communication is useful for the frequencies above 30 MHz
C) Sky wave propagation is useful in the range of 30 to 40 MHz
D) Sky wave propagation takes place through tropospheric space
E) The phenomenon involved in sky wave propagation is total internal reflection.
Correct Answer: C
Solution :
In ground wave propagation, radiowaves travel along the surface of the earth (following the curvature of earth). Ground wave propagation can be sustained only at low frequencies (\[\tilde{\ }500\text{ }kHz\]to\[1500\text{ }kHz\]) or for radiobroadcast at long wavelengths. Satellite communication is useful for the frequencies above 30 MHz which takes place through tropospheric space. The phenomenon involved in the sky wave propagation is total internal reflection.
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