Question:
The frequency suitable for beyond the horizon communication using sky wave is
The frequency suitable for beyond the horizon communication using sky wave is
Show Hint
Sky wave propagation is generally possible for frequencies between
\[
3\,MHz \text{ and } 30\,MHz
\]
because such waves are reflected by the ionosphere.
Updated On: Jun 24, 2026
- \(10\,KHz\)
- \(10\,MHz\)
- \(1\,GHz\)
- \(1000\,GHz\)
Show Solution
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The Correct Option is B
Solution and Explanation
Step 1: Understand sky wave communication.
In sky wave communication, radio waves are reflected back to the Earth by the ionosphere. This method is used for long-distance or beyond-the-horizon communication.
Step 2: Recall the suitable frequency range.
Sky wave propagation is possible only for frequencies approximately between \[ 3\,MHz \text{ and } 30\,MHz \] Frequencies much lower than this are absorbed, while frequencies much higher than this penetrate the ionosphere and do not return to Earth.
Step 3: Check the given options.
\[ 10\,KHz=0.01\,MHz \] which is too low for sky wave communication.
\[ 10\,MHz \] lies within the suitable range of \[ 3\,MHz \text{ to } 30\,MHz \] Hence, it is suitable for sky wave communication.
\[ 1\,GHz \] and \[ 1000\,GHz \] are extremely high frequencies and pass through the ionosphere instead of getting reflected.
Step 4: Final conclusion.
Therefore, the suitable frequency is \[ \boxed{10\,MHz} \]
In sky wave communication, radio waves are reflected back to the Earth by the ionosphere. This method is used for long-distance or beyond-the-horizon communication.
Step 2: Recall the suitable frequency range.
Sky wave propagation is possible only for frequencies approximately between \[ 3\,MHz \text{ and } 30\,MHz \] Frequencies much lower than this are absorbed, while frequencies much higher than this penetrate the ionosphere and do not return to Earth.
Step 3: Check the given options.
\[ 10\,KHz=0.01\,MHz \] which is too low for sky wave communication.
\[ 10\,MHz \] lies within the suitable range of \[ 3\,MHz \text{ to } 30\,MHz \] Hence, it is suitable for sky wave communication.
\[ 1\,GHz \] and \[ 1000\,GHz \] are extremely high frequencies and pass through the ionosphere instead of getting reflected.
Step 4: Final conclusion.
Therefore, the suitable frequency is \[ \boxed{10\,MHz} \]
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