Two identical antennas mounted on identical towers are separated from each other by a distance of $45 \, km$. What should be the minimum height of the receiving antenna to receive the signals in line of sight? (Assume radius of earth is $6400 \, km$)
- A$19.77$
- B$39.55$
- C$79.1$
- D$158.2$
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Assertion $(A)$: Television signals are received through sky-wave propagation.
Reason $(R)$: The ionosphere reflects electromagnetic waves of frequencies in the range $(3-30)$ $MHz$.
Choose the correct option.
Reason $(R)$: The ionosphere reflects electromagnetic waves of frequencies in the range $(3-30)$ $MHz$.
Choose the correct option.
Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).Column $A$ Column $B$ $A$. $D$-layer $I$. $250-400 \ km$ $B$. $E$-layer $II$. $170-190 \ km$ $C$. $F_1$-layer $III$. $95-120 \ km$ $D$. $F_2$-layer $IV$. $65-75 \ km$
| Column $A$ | Column $B$ |
| $A$. $D$-layer | $I$. $250-400 \ km$ |
| $B$. $E$-layer | $II$. $170-190 \ km$ |
| $C$. $F_1$-layer | $III$. $95-120 \ km$ |
| $D$. $F_2$-layer | $IV$. $65-75 \ km$ |
Range of frequencies allotted for commercial $FM$ radio broadcast is
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Ground waves are polarized in which direction?
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