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To help compare different orders of magnitude, the following list describes various frequencies.
[edit] Examples
- 0.25 Hz, approximate frequency of an adult human's resting breathing rate
- 1 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
[edit] 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
[edit] Radio spectrum
[edit] See also
