Question: Q. 11. Distinguish between ‘sky wave’ and ‘space wave’ modes of propagation in a communication system.
R [Delhi Comptt., I, II, III, 2016]
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Solution:
Ans.
| S.No | Sky Wave | Space Wave |
|---|---|---|
| (i) | Restricted up to a few MHz frequency (3 to $40 \mathrm{MHz})$ |
Can take place (even) beyond $40 \mathrm{MHz}$ fre- quency. |
| (ii) | Waves are reflected back from iono- sphere. |
Space waves travel in a straight line, either directly from transmit- ting antenna to receiv- ing antenna or, through satellite. |
[CBSE Marking Scheme, 2016] 2
