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(B) The frequency of the signal is $5 \ MHz$. Ground wave propagation is effective for frequencies up to $2 \ MHz$ to $3 \ MHz$ because the attenuatio

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Sky wave propagation

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(B) The frequency of the signal is $5 \ MHz$. Ground wave propagation is effective for frequencies up to $2 \ MHz$ to $3 \ MHz$ because the attenuation of ground waves increases rapidly with frequency. Sky wave propagation is effective for frequencies in the range of $3 \ MHz$ to $30 \ MHz$ as these waves are reflected by the ionosphere. Since $5 \ MHz$ lies within the range of $3 \ MHz$ to $30 \ MHz$,the signal can be received via sky wave propagation. Therefore,the correct option is $B$.

$A$ receiving station on the ground is receiving a signal of frequency $5 \ MHz$ from a transmitter. Then the signal can come via

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