1 ultralow frequency | Definition of ultralow frequency
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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

First Known Use of ultralow frequency

1994, in the meaning defined above

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