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Assertion (A) : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason (R) : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency. |
Both (A) and (R) are true and (R) is the correct explanation of (A). Both (A) and (R) are true but(R) is NOT the correct explanation of (A). (A) is true but (R) is false. Both (A) and (R) are false. |
(A) is true but (R) is false. |
For total of the ionosphere should be less. If f>fc'f> the refractive index will increase. |
