Picosecond: Difference between revisions
Content deleted Content added
No edit summary Tag: Reverted |
Undid revision 1107576956 by 50.86.122.194 (talk) |
||
| Line 1: | Line 1: | ||
{{Short description|One trillionth of a second}} |
{{Short description|One trillionth of a second}} |
||
A ''' |
A '''''' (abbreviated as '''''') is a [[unit of time]] in the [[International System of Units]] (SI) equal to 10<sup>−12</sup> or {{frac|1|1 000 000 000 000}} (one trillionth) of a [[second]]. That is one trillionth, or onemillionth of onemillionth of a second, or 0.000 000 000 001 seconds. A picosecond is to one second as one second is to approximately 31,689 years. Multiple technical approaches achieve imaging within single-digit picoseconds: for example, the [[streak camera]] or [[Intensified charge-coupled device|intensified CCD (ICCD) cameras]] are able to picture the motion of light.<ref>{{cite web|url=http://web.mit.edu/newsoffice/2011/trillion-fps-camera-1213.html|title=Trillion-frame-per-second video|publisher=Massachusetts Institute of Technology|access-date=2014-03-06}}</ref><ref>{{cite web|url=http://www.stanfordcomputeroptics.com/applications/iccd-methods/ultra-high-speed-imaging.html|title=Ultra high speed CCD cameras capture the motion of light.|publisher=Stanford Computer Optics|access-date=2014-03-06}}</ref> |
||
One picosecond is equal to 1000 [[femtosecond]]s, or 1/1000 [[nanosecond]]s. Because the next SI unit is 1000 times larger, measurements of 10<sup>−11</sup> and 10<sup>−10</sup> second are typically expressed as tens or hundreds of picoseconds. Some notable measurements in this range include: |
One picosecond is equal to 1000 [[femtosecond]]s, or 1/1000 [[nanosecond]]s. Because the next SI unit is 1000 times larger, measurements of 10<sup>−11</sup> and 10<sup>−10</sup> second are typically expressed as tens or hundreds of picoseconds. Some notable measurements in this range include: |
||
Revision as of 10:54, 31 August 2022
A picosecond (abbreviated as ps) is a unit of time in the International System of Units (SI) equal to 10−12 or 1⁄1 000 000 000 000 (one trillionth) of a second. That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds. A picosecond is to one second as one second is to approximately 31,689 years. Multiple technical approaches achieve imaging within single-digit picoseconds: for example, the streak camera or intensified CCD (ICCD) cameras are able to picture the motion of light.[1][2]
One picosecond is equal to 1000 femtoseconds, or 1/1000 nanoseconds. Because the next SI unit is 1000 times larger, measurements of 10−11 and 10−10 second are typically expressed as tens or hundreds of picoseconds. Some notable measurements in this range include:
- 1.0 picoseconds (1.0 ps) – cycle time for electromagnetic frequency 1 terahertz (THz) (1 x 1012 hertz), an inverse unit. This corresponds to a wavelength of 0.3 mm, as can be calculated by multiplying 1 ps by the speed of light (approximately 3 x 108 m/s) to determine the distance traveled. 1 THz is in the far infrared.
- 1 picosecond – time taken by light in a vacuum to travel approximately 0.30 mm
- 1 picosecond – half-life of a bottom quark
- ~1 picosecond – lifetime of a single H
3O+
(hydronium) ion in water at 20 °C[3] - picoseconds to nanoseconds – phenomena observable by dielectric spectroscopy
- 1.2 picoseconds – switching time of the world's fastest transistor (845 GHz, as of 2006)[4]
- 1.7 picoseconds - rotational correlation time of water[5]
- 3.3 picoseconds (approximately) – time taken for light to travel 1 millimeter
- 10 picoseconds after the Big Bang – electromagnetism separates from the other fundamental forces
- 34 picoseconds - signal rise time (20% to 80%) of a SFP+ transmitter for 10 Gigabit Ethernet.[6]
- 10–150 picoseconds – rotational correlation times of a molecule (184 g/mol) from hot to frozen water[7]
- 100 picoseconds - Unit Interval of a 10 Gbps serial communication link, such as USB 3.1.[8]
- 108.7827757 picoseconds – transition time between the two hyperfine levels of the ground state of the caesium-133 atom at absolute zero
- 330 picoseconds (approximately) – the time it takes a common 3.0 GHz computer CPU to complete a processing cycle
See also
References
- ^ "Trillion-frame-per-second video". Massachusetts Institute of Technology. Retrieved 2014-03-06.
- ^ "Ultra high speed CCD cameras capture the motion of light". Stanford Computer Optics. Retrieved 2014-03-06.
- ^ "Lifetime of single hydronium (H3O+) ion at 20°C". BioNumbers. Retrieved 2011-10-10.
- ^ James E. Kloeppel (2006-12-11). "World's Fastest Transistor Approaches Goal of Terahertz Device".
- ^ Lankhorst, D.; Schriever, J.; Leyte, J. C. (1982). "Determination of the Rotational Correlation Time of Water by Proton NMR Relaxation in H217O and Some Related Results". Berichte der Bunsengesellschaft für physikalische Chemie. 86 (3): 215–221. doi:10.1002/bbpc.19820860308.
- ^ SFF Committee. "SFF-8431 Specifications for Enhanced Small Form Factor Pluggable Module SFP+" (PDF).
- ^ Bulla, I.; Törmälä, P.; Lindberg, J. J.; Mikalsen, Ø.; Southern, J. T.; Edlund, K.; Eliasen, M.; Herskind, C.; Laursen, T.; Pedersen, P. M. L. (1975). "Spin Probe Studies on the Dynamic Structure of Dimethyl Sulfoxide-Water Mixtures". Acta Chemica Scandinavica. 29a: 89–92. doi:10.3891/acta.chem.scand.29a-0089.
- ^ "Universal Serial Bus 3.1 Specification" (PDF).