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To help compare different orders of magnitude, the following list describes various frequencies.

Examples

• 0.25 Hz, approximate frequency of an adult human's resting breathing rate
• 1 to 1.66666666... Hz, approximate frequency of an adult human's resting heart beat
• 2 Hz, 120 bpm, one of the most common tempos in music.
• 10 Hz, cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm)
• 50 Hz or 60 Hz (50 Hz for European AC, Tokyo AC or 60 Hz for American AC, Osaka AC), electromagnetic — standard AC mains power
• 100 Hz, cyclic rate of a typical automobile engine at redline (equivalent to 6000 rpm)
• 261.626 Hz, acoustic — the musical note middle C
• 440 Hz, acoustic — concert pitch (A above middle C), used for tuning musical instruments
• 20 Hz to ~14 kHz, acoustic — normal range of adult human hearing (most children and some animals perceive sounds outside this range, most teens and children can hear frequencies from 14 kHz up to ~16 kHz where most adults can't)
• 17.4 kHz, a frequency know as "The Mosquito," used by The Mosquito to discourage loitering. This frequency is generally only audible to those under the age of 24.
• 530 kHz to 1.710 MHz, electromagnetic — AM radio broadcasts
• 740 kHz, transitions — the clock speed of the world's first commercial microprocessor, the Intel 4004 (1971)
• 1 MHz to 8 MHz, transitions — clock speeds of early home/personal computers (mid-1970s to mid-1980s)
• 42 MHz to 260 MHz, electromagnetic — VHF terrestrial TV broadcast channels
• 88 MHz to 108 MHz, electromagnetic — FM radio broadcasts
• 902 MHz to 928 MHz, common cordless telephone frequency in the US
• 1420 MHz — the hyperfine transition of hydrogen, also known as the hydrogen line or 21 cm line
• 0.8 to 2.3 GHz, (electromagnetic) - mobile phone conversation channels.
• 1920-1930 MHz, another common cordless telephone frequency introduced to the US in October 2005
• 2.4 GHz, (electromagnetic) - microwave ovens, Wireless LANs and cordless phones (starting in 1998).
• 3.80 GHz, transitions — highest clock speed Pentium 4 "Prescott" microprocessor (2005)
• 5.8 GHz, cordless phone frequency introduced in 2003
• 845 GHz, fastest transistor (Dec. 2006)
• 428 THz to 750 THz, electromagnetic — visible light, from red to violet
• 2.47 × 10¹⁵ hertz (2.47 petahertz) — Lyman-alpha line
• 30 Petahertz (PHz), electromagnetic — x-rays
• 300 Exahertz (EHz) and above - gamma rays
• 1.85×10⁴³ Hz - Planck frequency, the inverse of the Planck time

Lower frequencies

• Once per minute (one rpm): about 16.667 mHz
• Hourly: about 277.8 µHz
• Daily: about 11.57 µHz
• Weekly: about 1.653 µHz
• Monthly: about 380.5 nHz
• Yearly: about 31.71 nHz
• Once per decade: about 3.171 nHz
• Once per generation: about 1 nHz
• Once per century: about 317.1 pHz
• Once per millennium: about 31.71 pHz

Radio spectrum

See also

• Hertz

Wikipedia content modification information:

• This page was last modified on 13 November 2008, at 02:52.

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