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Electromagnetic waves with frequencies g...

Electromagnetic waves with frequencies greater than the critical frequency of lonosphere cannot be used for communication using sky wave propagation because

A

R.I of ionosphere becomes very high for `fgtf_(c)`

B

R.I of ionosphere becomes very low for `fgtf_(c)`

C

R.I of ionosphere becomes very high for `f lt f_(c)`

D

None

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The correct Answer is:
A
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Electromagnetic waves with frequency greater than the critical frequency of ionosphere cannot be used for communication using sky wave propagation, because:

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AAKASH SERIES-COMMUNICATION SYSTEMS -Exercise - IA (Sky Wave propagation)
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  12. Two waves A and B of frequencies 2MHz and 3MHz, respectively are beame...

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