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 1.66... Hz, approximate frequency of an adult human's resting heart beat
- 1Hz, 60; 2 Hz, 120 bpm, 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 ~18 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
- 30–88 MHz: Military VHF-FM, including SINCGARS
- 43–50 MHz: Cordless telephones, 49 MHz FM walkie-talkies and radio controlled toys, and mixed 2-way mobile communication. The FM broadcast band originally operated here (42-50 MHz) before moving to 88-108 MHz.
- 50–54 MHz: Amateur radio 6 meter band; 50 MHz is an amateur radio band used for a variety of uses including DXing, FM repeaters and radio control
- 55-72 and 77-88 MHz TV channels 2 through 6, known as "Band I" internationally; a tiny number of HDTV stations will appear here. See North American broadcast television frequencies
- 72–76 MHz: Radio controlled models, industrial remote control, and other devices. Model aircraft operate on 72 MHz while surface models operate on 75 MHz, air navigation beacons 74.8-75.2 MHz.
- 88 MHz to 108 MHz, electromagnetic — FM radio broadcasts
- 108–118 MHz: Air navigation beacons VOR
- 118–137 MHz: Airband for air traffic control, AM, 121.5 MHz is emergency frequency
- 137-138 Space research,space operations, meteorological satellite [1]
- 138–144 MHz: Land mobile, auxiliary civil services, satellite, space research, and other miscellaneous services
- 144–148 MHz: Amateur radio band 2 Meters
- 148-150 Land mobile, fixed, satellite
- 150–156 MHz: "VHF Business band," the unlicensed Multi-Use Radio Service (MURS), and other 2-way land mobile, FM
- 156–158 MHz VHF Marine Radio; narrow band FM, 156.8 MHz (Channel 16) is the maritime emergency and contact frequency.
- 160-161 MHz Railways [2]
- 162.40–162.55: NOAA Weather Stations, narrowband FM
- 175-216 MHz television channels 7 - 13, known as "Band III" internationally. A minority of HDTV channels may appear here.
- 174–216 MHz: professional wireless microphones (low power, certain exact frequencies only)
- 174-230 MHZ, electromagnetic - VHF digital audio broadcasting frequencies in the UK (Also callled band III).
- 216–222 MHz: land mobile,fixed, maritime mobile ,[3]
- 222–225 MHz: 1.25 meters (US) ( Canada 219-220, 222-225 MHz) Amateur radio
- 225 MHz and above: Military aircraft radio (225–400 MHz) AM, including HAVE QUICK, dGPS RTCM-104
- 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
References
- ^ Industry Canada, Canadian Table of Frequency Allocations 9 kHz - 275 GHz, 2005 Edition (revised February 2007) pg. 29
- ^ The 160 and 161 areas are AAR 99 channel railroad radios issued to the railroad (Sample, AAR 21 is 160.425 and that is issued to TVRM and other railroads that want AAR 21)
- ^ Canadian table pg. 30
See also
Categories: Orders of magnitude
