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Wave Optics
Question
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Why communication at frequencies above 20 MHz is generally carried out with the help of satellites?

Answer

Frequency above 20 MHz is carried out with the help of satellites because

a) Higher frequencies being greater than critical frequency cannot be reflected by the ionosphere.

(b) The co-axial cables and wires are extremely radiating in nature at this high frequency which causes disruption in transmission.

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Some More Questions From Wave Optics Chapter

Which of the following frequencies will be suitable for beyond-the-horizon communication using sky waves?

Frequencies in the UHF range normally propagate by means of

Digital signals
(i)    do not provide a continuous set of values,
(ii)    represent values as discrete steps,
(iii)    can utilize binary system, and
(iv)    can utilize decimal as well as binary systems.
Which of the above statements are true?

What is space wave propagation?