Q. Three waves $A$, $B$ and $C$ of frequencies $1600, kHz$, $5 ,MHz$ and $60, MHz$, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication?

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Three waves $A$, $B$ and $C$ of frequencies $1600, kHz$, $5 ,MHz$ and $60, MHz$, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication?

Solution:

$A$ is transmitted via ground wave, $B$ via sky wave and $C$ via space wave.