Sky wave propagation is not possible for freq | vedclass

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(C) Sky wave propagation relies on the reflection of radio waves by the ionosphere. The ionosphere can only reflect electromagnetic waves with frequen

Vedclass · Accepted Answer

greater than $30\, MHz$

Vedclass · Answer

(C) Sky wave propagation relies on the reflection of radio waves by the ionosphere. The ionosphere can only reflect electromagnetic waves with frequencies up to approximately $30\, MHz$. For frequencies greater than $30\, MHz$,the waves penetrate the ionosphere and escape into space instead of being reflected back to Earth. Therefore,sky wave propagation is not possible for frequencies greater than $30\, MHz$.

List-$I$	List-$II$
$A$. $AM$ Broadcast	$I$. $88-108\,MHz$
$B$. $FM$ Broadcast	$II$. $540-1600\,kHz$
$C$. Television	$III$. $3.7-4.2\,GHz$
$D$. Satellite Communication	$IV$. $54-890\,MHz$

Sky wave propagation is not possible for frequencies

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Match List-$I$ with List-$II$:

List-$I$ List-$II$

$A$. $AM$ Broadcast $I$. $88-108\,MHz$

$B$. $FM$ Broadcast $II$. $540-1600\,kHz$

$C$. Television $III$. $3.7-4.2\,GHz$

$D$. Satellite Communication $IV$. $54-890\,MHz$

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The attenuation in optical fibre is mainly due to

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