Look up nanosecond in Wiktionary, the free dictionary.
A nanosecond (ns) is an SI unit of time equal to one thousand-millionth of a second (or one billionth of a second), that is, 1/1,000,000,000 of a second, or 10−9 seconds.
The term combines the prefix nano- with the basic unit for one-sixtieth of a minute.
A nanosecond is equal to 1000 picoseconds or 1⁄1000 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 encountered in telecommunications, pulsed lasers, and related aspects of electronics.
Common measurements
0.5 nanoseconds – the half-life of beryllium-13.
0.96 nanoseconds – 100 Gigabit Ethernet Interpacket gap
1.0 nanosecond – cycle time of an electromagnetic wave with a frequency of 1 GHz (1×109 hertz).
1.0 nanosecond – electromagnetic wavelength of 1 light-nanosecond. Equivalent to 0.3m radio band.
1.016703362164 nanoseconds (by definition) – time taken by light to travel 1 foot in a vacuum.[n 1]
3.3356409519815 nanoseconds (by definition) – time taken by light to travel 1 metre in a vacuum.[1]
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 (1×108 hertz), radio wavelength 3 m (VHF, FM band)
12 nanoseconds – mean lifetime of a K meson[2]
10 nanoseconds – half-life of lithium-12
20–40 nanoseconds – time of fusion reaction in a hydrogen bomb
30 nanoseconds – half-life of carbon-21
77 nanoseconds – a sixth (a 60th of a 60th of a 60th of a 60th of a second)
96 nanoseconds – Gigabit Ethernet Interpacket gap
100 nanoseconds – cycle time for frequency 10 MHz, radio wavelength 30 m (shortwave)
299 nanoseconds – half-life of polonium-212
333 nanoseconds – cycle time of highest medium wave radio frequency, 3 MHz
500 nanoseconds – T1 time of Josephson phase qubit (see also Qubit) as of May 2005
1,000 nanoseconds – one microsecond
1,000,000 nanoseconds – one millisecond (ms)
See also
International System of Units
Jiffy (time)
Microsecond
Millisecond
Orders of magnitude (time)
Picosecond
Second
References
Notes
^By definition of the "foot" as exactly 1/3 yards, and of the international yard as "exactly 0.9144 metres", and of the metre (SI unit) defined by the International 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 a vacuum is therefore (1/299792458)x(0.9144/3) seconds, or 1.016703362164 nanoseconds.
Citations
^
"Official BIPM definition of the metre". BIPM. Retrieved 2008-09-22.
^http://pdg.lbl.gov/2012/listings/rpp2012-list-K-plus-minus.pdf. Missing or empty |title= (help); External link in |website= (help); Missing or empty |url= (help)
v
t
e
Orders of magnitude of time
by powers of seconds
Negative powers
Planck time
<1 attosecond
Attosecond
Femtosecond
Picosecond
Nanosecond
Microsecond
Millisecond
Positive powers
Second
Kilosecond
Megasecond
Gigasecond
Terasecond and longer
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