Question: Q. 1. (i) What is line of sight communication?
(ii) Why is it not possible to use sky waves for transmission of TV signals? Upto what distance can a signal be transmitted using an antenna of height ’ $h$ ‘?
R [2017 Delhi set-3]
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Solution:
Ans. (i) Communication, using waves which travel in straight line from transmitting antenna to receiving antenna is called line of sight communication. $\mathbf{1}$
(ii) Because T.V. signal waves are not reflected back by the ionosphere
$$ d=\sqrt{2 h R} $$
[CBSE Marking Scheme, 2017]
