Movatterモバイル変換

Nanosecond

From Wikipedia, the free encyclopedia

One billionth of a second

nanosecond
Unit system	SI
Unit of	time
Symbol	ns
Conversions
1 nsin ...	... is equal to ...

SI units	10⁻⁹ s

Look upnanosecond in Wiktionary, the free dictionary.

Ananosecond (ns) is a unit oftime in theInternational System of Units (SI) equal to one billionth of asecond, that is,⁠1/1000000000⁠ of a second, or10⁻⁹ seconds.

The term combines theSI prefixnano- indicating a 1 billionth submultiple of an SI unit (e.g. nanogram,nanometre, etc.) andsecond, the primary unit of time in the SI.

A nanosecond is to one second, as one second is to approximately 31.69 years.

A nanosecond is equal to 1000 picoseconds or⁠1/1000⁠ microsecond. Time units ranging between 10⁻⁸ and 10⁻⁷ seconds are typically expressed as tens or hundreds of nanoseconds.

Time units of this granularity are commonly found intelecommunications, pulsedlasers, and related aspects ofelectronics.

Common measurements

[edit]

0.001 nanoseconds – one picosecond
0.96 nanoseconds –100 Gigabit Ethernet Interpacket gap
96 nanoseconds –Gigabit Ethernet Interpacket gap
1.0 nanosecond – cycle time of an electromagnetic wave with afrequency of 1 GHz (10⁹ hertz).
1.0 nanosecond – electromagneticwavelength of 1 light-nanosecond. Equivalent to 0.3 m radio band.
1 nanosecond – time precision inGo^[1]^[2]^[3]
1.016703362164 nanoseconds (bydefinition) – time taken by light to travel 1foot in vacuum.^{[n 1]}
3.3356409519815 nanoseconds (bydefinition) – time taken bylight to travel 1metre in vacuum.^[4]
8 nanoseconds – typicalpropagation delay of74HC series logic chips based onHCMOS technology, commonly used for digital electronics in the mid-1980s.^[5]
10 nanoseconds – one "shake", (as in a "shake of a lamb's tail") approximate time of one generation of a nuclear chain reaction with fast neutrons
10 nanoseconds – cycle time for frequency 100 MHz (10⁸ hertz), radio wavelength 3 m (VHF,FM band)
10 nanoseconds – half-life oflithium-12
12 nanoseconds – mean lifetime of a chargedK meson^[6]
20–40 nanoseconds – time of fusion reaction in ahydrogen bomb
30 nanoseconds – half-life ofcarbon-21
77 nanoseconds – a sixth (a 60th of a 60th of a 60th of a 60th of a second)
100 nanoseconds – cycle time forfrequency 10 MHz, radio wavelength30 m (shortwave)
294.4 nanoseconds – half-life ofpolonium-212^[7]
333 nanoseconds – cycle time of highestmedium wave radio frequency, 3 MHz
500 nanoseconds – T1 time of Josephsonphase qubit (see alsoQubit) as of May 2005
1000 nanoseconds – one microsecond

References

[edit]

Notes

^By definition of the "foot" as exactly 1/3 yards, and of theinternational yard as "exactly 0.9144 metres", and of the metre (SI unit) defined by theInternational Bureau of Weights and Measures as the "length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second". The time taken by light to travel 1 foot in vacuum is therefore (1/299792458) × (0.9144/3) seconds, or1.016703362164 nanoseconds.

Citations

^"time package - time - Go Packages".pkg.go.dev. Retrieved2025-01-29.
^"It's Go Time on Linux".The Cloudflare Blog.Archived from the original on 2024-10-05. Retrieved2025-01-29.time.Now() now gets real nanosecond resolution on supported systems
^"Comprehensive Guide to Dates and Times in Go".Boot.dev Blog. 2021-05-17. Retrieved2025-01-29.The default time.Time type represents an instant in time with nanosecond precision
^"Official BIPM definition of the metre".BIPM. Archived fromthe original on 2003-10-29. Retrieved2008-09-22.
^Philips Semiconductors."74HC-T-U-User-Guide"(PDF).Archived(PDF) from the original on 2022-10-09.
^Beringer, J."K^±"(PDF).pdg.lbl.gov.
^Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3) 030001.doi:10.1088/1674-1137/abddae.

External links

[edit]

Visual representation of a nanosecond Grace Hopper explains the nanosecond

v t e Orders of magnitude of time
bypowers of ten
Negative powers	<1 attosecond attosecond femtosecond picosecond nanosecond microsecond millisecond
Positive powers	second kilosecond megasecond gigasecond terasecond and longer