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Electromagnetic waves with frequency gre...

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

A

The refractive index of lonosphere becomes very high for `f gt f_(c)`

B

The refractive index of ionosphere becomes very low for `f gt f_(c)`

C

The refractive index of ionosphere becomes very high for `f lt f_(c)`

D

The refractive index of ionosphere becomes very low for `f lt f_(c)`

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The correct Answer is:
A
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