Question

Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves? (a) 10 kHz (b) 10 MHz (c) 1 GHz (d) 1000 GHz

Answer 1

answer : option (b) 10 MHz

explanation : 10KHz is not suitable for beyond the horizontal communication because it will require large radiating antenna.

same way, 1GHz and 1000GHz will not suitable for sky waves because waves will pass through ionosphere and will not be reflected by it.

and hence, 10MHz will be most suitable for beyond - the - horizontal communication using sky wave.

so, option (b) is correct choice.

also read : A modulating signal is a square wave, as shown in Fig. 15.14. The carrier wave is given by c(t) = 2sin(8πt) volts (i) Sk...

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Answer 2

ANSWER: B

✨Explanation ✨

10 MHz frequency will be suitable for beyond the horizon communication using skywaves.

10 KHz cannot be transmitted because the size of the antenna will be large for this apparently lower frequency.1 and 1000 GHz are very high frequency wave which will penetrate and so cannot be transmitted.