Discussion
Following are the mediums of communication :
(i) sea water
(ii) sky waves
(iii) space waves
(iv) glass fibers
The correct sequence of operating frequencies in increasing order are :
Answer: B
The operating frequencies increase in this order. Communication through sea water is possible only at very low frequencies, because sea water absorbs higher frequencies strongly, so (i) is the lowest. Sky waves, reflected from the ionosphere, are used in the high frequency band, so (ii) comes next. Space waves, used for line of sight communication, work in the very high and ultra high frequency bands and above, so (iii) follows. Glass fibres carry light, at frequencies of the order of hundreds of terahertz, so (iv) is the highest. The sequence is (i), (ii), (iii), (iv). The answer is (i), (ii), (iii), (iv).
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