Long wave refers to a type of radio signal with very low frequency and long wavelength, typically ranging from 30 kHz to 300 kHz. These signals can travel great distances, even around obstacles like mountains, by following the Earth's surface or reflecting off the atmosphere. Long wave is often used for applications like sea communication, navigation systems, and broadcasting in areas where signals need to cover large regions with minimal loss of strength. It is less commonly used today due to advancements in other communication technologies.

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