Which one of the following statement is wrong

Options

A. Radio waves in the frequency range 30 MHz to 60 MHz are called sky waves.
B. Radio horizon of the tramitting antenna for space wave is ` d_(T)= sqrt( (2Rh_T) )` , R= Radius of earth , `h_(T)`= height of transmitting antenna ).
C. Within the skip distance neigthe the ground waves nor the sky waves are received.
D. The principle of fibre optical communication is total internal reflection.

Answer

A

Explanation

The sky wave are the radio waves of frequency between 2 MHz to 30 MHz.