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Which mechanism primarily limits data transmission distance for high-frequency radio waves in seawater?

A)Dielectric absorption by polar water molecules
B)Signal dispersion from thermoclines
C)Refraction due to salinity gradients
D)Path loss from seabed reflections

💡 Explanation

When high-frequency radio waves propagate in seawater, dielectric absorption occurs because polar water molecules oscillate in response to the electric field, dissipating energy as heat, limiting the wave's penetration depth. Therefore dielectric loss dominates, unlike dispersion, refraction, or path loss, effects which are secondary at higher frequencies.

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