ultralow frequency

noun

Definition of ultralow frequency 

: a radio frequency in the lower range of the radio spectrum from about 300 Hz to 3 kHz Communicating with subs thousands of miles away, under thousands of feet of ocean, requires ultralow frequencies— Noah Shachtman, Wired, August 2009 abbreviation ULF — see Radio Frequencies Table

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First Known Use of ultralow frequency

1994, in the meaning defined above

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