Which of the following frequencies will be suitable for beyond-the horizon communication using sky waves?（ ）
Answer
B
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Solution
For sky wave, frequency,\(f=10\times 10^6\mathit{Hz}\)
Wavelength,\(\lambda =\dfrac c f=\dfrac{3\times 10^8}{10^7}=30\;m\)
It gets reflected easily from the ionosphere.
For option \(A\), antenna size is not possible.
The high-energy signal waves \((1\ GHz − 1,000\ GHz)\) penetrate the ionosphere and escape. Options \(C\) and \(D\) are incorrect.
\(10\ MHz\) frequencies get reflected easily from the ionosphere. Hence, signal waves of such frequencies are suitable for beyond-the-horizon communication.
Hence, option \((B)\) is correct.
Wavelength,\(\lambda =\dfrac c f=\dfrac{3\times 10^8}{10^7}=30\;m\)
It gets reflected easily from the ionosphere.
For option \(A\), antenna size is not possible.
The high-energy signal waves \((1\ GHz − 1,000\ GHz)\) penetrate the ionosphere and escape. Options \(C\) and \(D\) are incorrect.
\(10\ MHz\) frequencies get reflected easily from the ionosphere. Hence, signal waves of such frequencies are suitable for beyond-the-horizon communication.
Hence, option \((B)\) is correct.
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