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Low frequency waves have a very long wavelength. Radio waves are  the waves with the lowest frequency, also known as electromagnetic  radiation.  +++  Muddled, because theâ¦ question does not state in which context.
Ultra-low frequency waves have the smallest frequency. Many text books do not cover these waves and may only show AM radio waves with the smallest frequency. Ultra-low frequency (ULF) is used by the US Navy as they keep contact with submarines. Because ULF can penetrate solids and liquids, it is ideal for submarines.