During ground wave propagation, the transmitted waves gets attenuated because

Earth surface absorbs the waves

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frequency of the waves are too low

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energy content of these waves are high

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Earth surface offers resistance

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Solution

The correct option is D Earth surface offers resistance
During ground wave propagation of radio waves, a charge induced on the Earth's surface which takes the form of current as the wave propagate. The Earth offers resistance in the flow of induced current due to which the waves are attenuated.

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