1.

Which of the following frequencies, will be suitable for ‘beyond the horizon’ communication using sky waves? (1) 10 KHz (2) 10 MHz (3) 1 GHz (4) 1000 GHz

Answer»

Correct option: (1) 10 MHz

Explanation: 

10 KHz can not be used for long distance communication and 1 GHz and 1000 GHz will penetrate through the ionosphere. It is only 10 MHz that can get reflected back from the ionosphere.



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