The layer of the atmosphere that reflects low | vedclass

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Question

(A) The ionosphere is divided into several layers: $D$,$E$,$F_1$,and $F_2$. The $D$ layer is the lowest layer of the ionosphere,located at an altitude

Vedclass · Accepted Answer

$D$

Vedclass · Answer

(A) The ionosphere is divided into several layers: $D$,$E$,$F_1$,and $F_2$. The $D$ layer is the lowest layer of the ionosphere,located at an altitude of approximately $65 \ km$ to $90 \ km$. This layer exists only during the daytime because it is ionized by solar radiation. As soon as the sun sets,the ionization process stops,and the $D$ layer disappears due to the recombination of ions and electrons. This layer is responsible for the reflection of low-frequency $(LF)$ electromagnetic waves. Therefore,the correct option is $A$.

The layer of the atmosphere that reflects low frequency $(LF)$ electromagnetic waves during day time only is

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