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AL2006

... a football field, a supertanker, several miles, or anything longer.

-- The lowest number on your radio's AM dial is 55 or 550.  It stands for the frequency of 550 KHz.  The corresponding wavelength is 545 meters.

-- The US Navy operates a radio station in Maine that transmits on a frequency of 24.0 KHz.  The corresponding wavelength is 12.5 Kilometers !

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