Question: Q. 9. Give (brief) reasons for the following :
(i) We use the ‘sky wave mode of propagation, of electromagnetic wayes, only for frequencies up to 30 to
(ii) The LOS (Line of sight) communication via space waves base (fairly) limited range.
(iii) A mobile phone user gets an ‘uninterrupted link to talk’ while walking.
U] [Foreign, 2016]
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Solution:
Ans. (i) The ionosphere can act as a ‘reflector’ only for
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(ii) The range is (fairly) limited because the EM waves loose energy (fairly rapidly) when they glide over the surface of the earth.
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(iii) This is because of the presence of a network of base stations/cells which keep on passing the signals from one base station/cell to the other.
