Long range radio transmission is possible whe | vedclass

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Question

(B) Sky wave propagation is a mode of radio wave propagation in which radio waves are reflected or refracted back to the Earth from the ionosphere.Thi

Vedclass · Accepted Answer

$8 - 25\, MHz$

Vedclass · Answer

(B) Sky wave propagation is a mode of radio wave propagation in which radio waves are reflected or refracted back to the Earth from the ionosphere.This phenomenon is primarily used for long-distance communication.The ionosphere acts as a reflecting medium for radio waves within a specific frequency range.According to standard communication physics,the frequency range suitable for sky wave propagation is typically between $2\, MHz$ and $30\, MHz$.Comparing this with the given options,the range $8 - 25\, MHz$ falls within this specified limit.Therefore,option $B$ is the correct answer.

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	$IV$. $65-75 \ km$

Long range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen,the frequency of the radio waves must be in the range:

Similar Questions

Carrier waves are used for communicating signals over long distances because:

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 $IV$. $65-75 \ km$

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At a particular station,the $TV$ transmission tower has a height of $100\,m$. To triple its coverage range,the height of the tower should be increased to ......$m$.

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