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2. Utility frequency - Wikipedia

   en.wikipedia.org/wiki/Utility_frequency

   The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.

3. Cycle per second - Wikipedia

   en.wikipedia.org/wiki/Cycle_per_second

   The cycle per second is a once-common English name for the unit of frequency now known as the hertz (Hz). Cycles per second may be denoted by c.p.s., c/s, or, ambiguously, just "cycles" (Cyc., Cy., C, or c).

4. Audio frequency - Wikipedia

   en.wikipedia.org/wiki/Audio_frequency

   The SI unit of frequency is the hertz (Hz). It is the property of sound that most determines pitch. [1] The generally accepted standard hearing range for humans is 20 to 20,000 Hz. [2] [3] [4] In air at atmospheric pressure, these represent sound waves with wavelengths of 17 metres (56 ft) to 1.7 centimetres (0.67 in).

5. 52-hertz whale - Wikipedia

   en.wikipedia.org/wiki/52-hertz_whale

   The 52-hertz whale, colloquially referred to as 52 Blue, is an individual whale of unidentified species that calls at the unusual frequency of 52 hertz. This pitch is at a higher frequency than that of the other whale species with migration patterns most closely resembling the 52-hertz whale's [ 1 ] – the blue whale (10 to 39 Hz) [ 2 ] and ...

6. Orders of magnitude (frequency) - Wikipedia

   en.wikipedia.org/wiki/Orders_of_magnitude...

   1 hertz (Hz) 1 to 1.66 Hz: Approximate frequency of an adult human's resting heart beat: 1 Hz: 60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz

7. Avis Car Rental - Wikipedia

   en.wikipedia.org/wiki/Avis_Car_Rental

   The company was founded in 1946 with three cars at Willow Run Airport, [10] Ypsilanti, Michigan, by Warren Avis (August 4, 1915 – April 24, 2007). [8] It established branch operations across the United States over the next few years, becoming the second largest car rental company in the country by 1953.