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"This animation illustrates the generation of the debris and ejecta clouds after a spherical aluminum projectile impacts a thin aluminum plate at approximately 7 km/s. The frame interval is about 1 microsecond. A microsecond is an SI unit of time equal to one millionth (0.000001 or 10−6 or ) of a second. Its symbol is μs, sometimes simplified to us when Unicode is not available. A microsecond is equal to 1000 nanoseconds or of a millisecond. Because the next SI prefix is 1000 times larger, measurements of 10−5 and 10−4 seconds are typically expressed as tens or hundreds of microseconds. Examples * 1 microsecond (1 μs) – cycle time for frequency (1 MHz), the inverse unit. This corresponds to radio wavelength 300 m (AM medium wave band), as can be calculated by multiplying 1 μs by the speed of light (approximately ) 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. * 3.33564095 microseconds – the time taken by light to travel one kilometer in a vacuum * 5.4 microseconds – the time taken by light to travel one mile in a vacuum (or radio waves point-to-point in a near vacuum) * 8.01 microseconds – the time taken by light to travel one mile in typical single- mode fiber optic cable * 10 microseconds (μs) – cycle time for frequency 100 kHz, radio wavelength 3 km * 18 microseconds – net amount per year that the length of the day lengthens, largely due to tidal acceleration. * 20.8 microseconds – sampling interval for digital audio with 48,000 samples/s * 22.7 microseconds – sampling interval for CD audio (44,100 samples/s) * 38 microseconds – discrepancy in GPS satellite time per day (compensated by clock speed) due to relativity * 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 dataIntel Solid State Drive Product Specification * 100 microseconds (0.1 ms) – cycle time for frequency 10 kHz * 125 microseconds – sampling interval for telephone audio (8000 samples/s) * 164 microseconds – half-life of polonium-214 * 240 microseconds – half-life of copernicium-277 * 250 microseconds – cycle time for highest tone in telephone audio (4 kHz) * 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. * 489.67 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 meters per second due to its index of refraction). *The average human eye blink takes 350,000 microseconds (just over second). *The average human finger snap takes 150,000 microseconds (just over second). *A camera flash illuminates for 1,000 microseconds. *Standard camera shutter speed opens the shutter for 4,000 microseconds or 4 milliseconds. See also * International System of Units * Jiffy (time) * Orders of magnitude (time) * Picosecond * Millisecond References External links * The National Institute of Standards and Technology (NIST) Orders of magnitude (time) de:Sekunde#Abgeleitete Maßeinheiten "
"The King's School, Canterbury (England) Year 597 (DXCVII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 597 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events = By place = Byzantine Empire * Emperor Maurice writes his last will, in which he describes his ideas for governing the Byzantine Empire (his eldest son, Theodosius, will rule the East from Constantinople, and his second son, Tiberius, the West from Rome). * Autumn - Balkan Campaign: The Avars, strengthened by the tribute of the Franks, resume their campaign along the Danube River, and besiege the Byzantine fortress city of Tomis (modern Romania) on the Black Sea coast. Europe * Queen Fredegund defeats her old rival Brunhilda of Austrasia, who supports the claims of her grandsons Theudebert II and Theuderic II to the Frankish throne, against those of Fredegund's son Chlothar II. She dies a few months later at Paris and is buried in the Basilica of Saint Denis. * Chlothar II, age 13, becomes sole ruler of Neustria, and continues his mother's feud with Brunhilda. He is advised to prepare for war against Austrasia, the eastern part of the Frankish Kingdom. Britain * Ceolwulf succeeds his brother Ceol as king of Wessex. He becomes regent of Ceol's son Cynegils who is too young to inherit the throne. Asia * Mangalesha becomes king of the Chalukya Dynasty, after his brother Kirtivarman I dies. He rules as regent of Kirtivarman's son Pulakeshin II, and invades the territory of Khandesh and Gujarat (northwestern India). = By topic = Religion * Gregorian Mission: Augustine of Canterbury lands with a group of missionaries on the Isle of Thanet (South East England). He is welcomed by King Æthelberht of Kent, who accepts baptism (along with the rest of his court) at the behest of his Christian Frankish wife, Bertha. Æthelbert assigns Augustine and his 40 monks a residence at Canterbury, where they found a Benedictine monastery that will make the town a centre of Christianity (or 596). * June 9 - Columba, Irish missionary, dies in Iona (Inner Hebrides) and is buried by his monks in the abbey he has created. He works successfully towards the conversion of northern Britain. * December 25 - At Christmas, Christianity spreads rapidly in Kent; Augustine and his fellow-labourers baptise more than 10,000 Anglo-Saxons.A Chronicle of England (1864), James Edmund Doyle, p. 26 Law * England gets her first written code of laws from Æthelbert. The code is concerned with preserving social order, through compensation and punishment for personal injury (approximate date). Education * The King's School is founded by Augustine in Canterbury. He builds an abbey where the Benedictine teaching takes place. Births * Brahmagupta, Indian mathematician and astronomer (d. 668) * Chu Suiliang, chancellor of the Tang Dynasty (d. 658) * Fursey, Irish missionary (approximate date) Deaths * June 9 - Columba, Gaelic Irish missionary (b. 521) * Brenainn mac Cairbre, king of Uí Maine (or 601) * Ceol, king of Wessex (England) * Fredegund, queen and regent of Neustria * Kirtivarman I, king of the Chalukya Dynasty (India) * Zhiyi, de facto founder of Tiantai Buddhism (b. 538) References "
"The 1080s was a decade of the Julian Calendar which began on January 1, 1080, and ended on December 31, 1089. Significant people References "