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microsecond is an SI unit of time equal to one millionth (10 −6 or 1/ 1,000,000) of a second. Its symbol is μs. One microsecond is to one second as one second is to 11.574 days.
A microsecond is equal to 1000
nanoseconds or 1/ 1,000 milliseconds. Because the next SI unit is 1000 times larger, measurements of 10 −5 and 10 −4 seconds are typically expressed as tens or hundreds of microseconds. Examples [edit ] 1 microsecond (1 μs) – cycle time for frequency 1×10 6 hertz (1 MHz), the inverse unit. This corresponds to radio wavelength 300 m (AM mediumwave band), as can be calculated by multiplying 1 µs by the speed of light (approximately 300×10 6 m/s) to determine the distance travelled. 1 microsecond – the length of time of a high-speed, commercial strobe light flash (see air-gap flash). 1.8 microseconds – the amount of time subtracted from the Earth's day as a result of the 2011 Japanese earthquake. 2 microseconds – the lifetime of a muonium particle 2.68 microseconds – the amount of time subtracted from the Earth's day as a result of the 2004 Indian Ocean earthquake. [1 ] 3.33564095 microseconds – the time taken by light to travel one kilometer in a vacuum 4.63 microseconds – a fifth (a 60th of a 60th of a 60th of a second) 5.4 microseconds – the time taken by light to travel one mile in a vacuum 10 microseconds (μs) – cycle time for frequency 100 kHz, radio wavelength 3 km 17 microseconds: net amount per year that the length of the day lengthens, largely due to tidal acceleration. [ ] citation needed 20.8 microseconds – sampling interval for digital audio with 48000 samples/s 22.7 microseconds – sampling interval for CD audio (44100 samples/s) 38 microseconds – discrepancy in GPS satellite time per day (compensated by clock speed) due to relativity [2 ] 50 microseconds – cycle time for highest human-audible tone (20 kHz) 50 microseconds to read – the access latency for a modern Solid State Drive which holds non-volatile computer data [3 ] 100 microseconds (0.1 ms) – cycle time for frequency 10 kHz 125 microseconds – sampling interval for telephone audio (8000 samples/s) 240 microseconds – half-life of copernicium-277 250 microseconds – cycle time for highest tone in telephone audio (4 kHz) [ ] citation needed 277.8 microseconds – a fourth (a 60th of a 60th of a second), used in astronomical calculations by al-Biruni and Roger Bacon in 1000 and 1267 AD, respectively. [4 ] [5 ] For reference [edit ] The average human eye blink takes 350,000 microseconds (just over 1/3 of one second). The average human finger click takes 150,000 microseconds (just over 1/7 of one second). A camera flash illuminates for 1000 microseconds. Standard camera shutter speed opens the shutter for 4000 microseconds or 4 milliseconds. See also [edit ] References [edit ] External links [edit ]