Amicrosecondis a unit oftimein theInternational System of Units(SI) equal to onemillionth(0.000001 or 10−6or1⁄1,000,000) of asecond.Its symbol isμs,sometimes simplified touswhenUnicodeis not available.
| microsecond | |
|---|---|
| Unit system | SI |
| Unit of | time |
| Symbol | μs |
| Conversions | |
| 1 μsin... | ... is equal to... |
| SI units | 10−6s |
A microsecond is to one second, as one second is to approximately 11.57 days.
A microsecond is equal to 1000nanosecondsor1⁄1,000of amillisecond.Because the nextSI prefixis 1000 times larger, measurements of 10−5and 10−4seconds are typically expressed as tens or hundreds of microseconds.
Examples
edit- 1 microsecond (1μs) – cycle time forfrequency1×106hertz(1 MHz), the inverse unit. This corresponds to radio wavelength300m(AMmedium waveband), as can be calculated by multiplying 1 μs by thespeed of light(approximately3.00×108m/s).
- 1 microsecond – the length of time of a high-speed, commercialstrobe lightflash (seeair-gap flash).
- 1 microsecond –protein foldingtakes place on the order of microseconds (thus this is the speed ofcarbon-based life).
- 1.8 microseconds – the amount of time subtracted from the Earth'sdayas a result of the2011 Japanese earthquake.[1]
- 2 microseconds – the lifetime of amuoniumparticle.
- 2.68 microseconds – the amount of time subtracted from the Earth's day as a result of the2004 Indian Ocean earthquake.[2]
- 3.33564095 microseconds – the time taken bylightto travel onekilometrein avacuum.
- 5.4 microseconds – the time taken by light to travel onemilein a vacuum (or radio waves point-to-point in a near vacuum).
- 8 microseconds – the time taken by light to travel one mile in typicalsingle-mode fiber optic cable.
- 10 microseconds (μs) – cycle time for frequency100 kHz,radio wavelength3km.
- 18 microseconds – net amount per year that the length of the day lengthens, largely due totidal acceleration.[3]
- 20.8 microseconds –samplinginterval for digital audio with 48,000 samples/s.
- 22.7 microseconds – sampling interval forCDaudio (44,100 samples/s).
- 38 microseconds – discrepancy inGPSsatellitetime per day (compensated by clock speed) due torelativity .[4]
- 50 microseconds – cycle time for highesthuman-audibletone (20 kHz).
- 50 microseconds – to read the access latency for a modern solid state drive which holds non-volatile computer data.[5]
- 100 microseconds (0.1 ms) – cycle time for frequency 10 kHz.
- 125 microseconds – common sampling interval for telephone audio (8000 samples/s).[6]
- 164 microseconds –half-lifeofpolonium-214.
- 240 microseconds – half-life ofcopernicium-277.
- 260 to 480 microseconds - return trip ICMP ping time, including operating system kernel TCP/IP processing and answer time, between two Gigabit Ethernet devices connected to the same local area network switch fabric.
- 277.8 microseconds – a fourth (a 60th of a 60th of a second), used in astronomical calculations byal-BiruniandRoger Baconin 1000 and 1267 AD, respectively.[7][8]
- 490 microseconds – time for light at a 1550 nm frequency to travel 100 km in a singlemode fiber optic cable (where speed of light is approximately 200 million metres per second due to itsindex of refraction).
- The average human eyeblinktakes 350,000 microseconds (just over1⁄3second).
- The average human fingersnaptakes 150,000 microseconds (just over1⁄7second).
- Acamera flashilluminates for 1,000 microseconds.
- Standard camerashutter speedopens the shutter for 4,000 microseconds or 4 milliseconds.
- 584542 years of microseconds fit in 64 bits: (2**64)/(1e6*60*60*24*365.25).
See also
editReferences
edit- ^Gross, R.S. (14 March 2014)."Japan quake may have shortened Earth days, moved axis".JPL News. Jet Propulsion Laboratory.Retrieved23 August2019.
- ^Cook-Anderson, Gretchen; Beasley, Dolores (January 10, 2005)."NASA Details Earthquake Effects on the Earth".NASA.RetrievedSeptember 18,2021.
- ^MacDonald, Fiona."Earth's Days Are Getting 2 Milliseconds Longer Every 100 Years".ScienceAlert.Retrieved2017-03-08.
- ^Richard Pogge."GPS and Relativity".Retrieved2011-10-01.
- ^Intel Solid State Drive Product Specification
- ^Kumar, Anurag; Manjunath, D.; Kuri, Joy (2008),"Application Models and Performance Issues",Wireless Networking,Elsevier, pp. 53–79,doi:10.1016/b978-012374254-4.50004-1,ISBN978-0-12-374254-4,retrieved2022-08-08
- ^al-Biruni(1879).The chronology of ancient nations: an English version of the Arabic text of the Athâr-ul-Bâkiya of Albîrûnî, or "Vestiges of the Past".Translated by Sachau C Edward.W. H. Allen.pp. 147–149.OCLC9986841.
- ^ R Bacon(2000) [1928].The Opus Majus of Roger Bacon.translator: BR Belle.University of Pennsylvania Press.table facing page 231.ISBN978-1-85506-856-8.