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On October 20, 1983, the meter was officially redefined as the distance traveled by light in a vacuum during a time interval of 1/299,792,458 of a second.
Light travels at 299792.458 km/sec, so the period was chosen as 0.00000000335641 second, or 3.35641 x 10-9 second.
The original definitions (1799 and 1899) depended on a measured standard bar. In 1960, it was redefined as a relationship to the wavelength of light from ions of the element krypton. In 1980, the standard was based on the unusually cohesive wavelength of an iodine-stabilized helium-neon laser.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoOn October 20, the meter was redefined again. The definition states that the meter is the length of the path traveled by light in vacuum during a time interval of 1/299,792,458 of a second. (http://www.mel.nist.gov/div821/museum/timeline.htm)
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it is very hard to tell exactly when
Wiki User
∙ 13y agoSince 1983 the meter has been defined as the distance light travels in a vacuum in exactly 1/229,792,458th of a second
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What year was the Apple Lisa made?
1983
Was Darryl Strawberry the rookie of the year in 1983?
Yes. In 1983 Darryl Strawberry won the MLB National League Rookie of the Year Ron Kittle won the American League Rookie of the Year.
What won the Dutch league in 1983?
The team that won the Dutch league in the year 1983 was AFC Ajax.
What year was mlks birthday celebrated as a national holiday?
1983
What was date of Chinese New Year in 1983?
1 Jan.1983 More info about Chinese culture pls visit www.learnchinese.sg
How was the length of a standard meter redefined in the year 1983?
It was redefined as 3 feet...
How was the length of a meter redefined in the year 1993?
It was not. The current definition was established in 1983.
How was the lenght of a standard meter redefined in the year 1983?
they put thangs tew gether nd they brainstormed alot.
What was the length of a meter in the year 1791?
The meter was invented in 1791. As being 1/10,000,000 of the distance from the North Pole to the equator.
How was the length of the standard meter defined defined in the year 1791?
The metre was originally intended to be one ten-millionth of the distance from the equator to the north pole running through Paris (making the distance from the equator to the north pole 10,000 km and the circumference of the earth 40,000 km [round that great circle]). It has since been redefined
What units is the radius of a circle measured in?
Any unit of length: millimeter, meter, kilometer, light-year, etc.
Why it is not rounded into 366 days in a year?
Because that is not the length of the year. The length of the year is 365.2422 days.Because that is not the length of the year. The length of the year is 365.2422 days.Because that is not the length of the year. The length of the year is 365.2422 days.Because that is not the length of the year. The length of the year is 365.2422 days.
What is the nonstandard unit for length?
The standard unit of length is the meter, and any multiple and submultiple such as kilometer and millimeter. Nonstandard units include foot, inch, mile, light-year, parsec, astronomical unit.
How are basic units of length volume and mass related?
The base unit of length is the meter, the unit of volume is the cubic meter. You can also take the third power of other units of length to get a unit of volume, for example cubic foot, cubic light-year or cubic angstrom. The basic unit of mass is the kilogram; it is not currently derived from the unit of length, although it was originally defined as the mass of one cubic decimeter of water.
What year was dan marinos rookie year?
1983.
What is length in physics?
A physical quantity measured in one dimension. Breadth, diameter, radius, depth, height, thickness, distance, displacement, diagonal, side all belong to length Meter is the unit for length in SI system of units For convenience we use mm, micrometer, nanometer, Angstrom, femtometer As larger units we use, kilo meter, astronomical distance, light year
In which year was Star Wars Return of the Jedi released?
May 25, 1983
