my technical drawing teacher wants to know and i have kno clue..
2006-09-10 16:33:39 · 16 answers · asked by Anonymous in Education & Reference ➔ Primary & Secondary Education
US atomic clock in Boulder Colorado run by bureau of weights and measures
2006-09-10 16:35:12 · answer #1 · answered by Freddy 3 · 0⤊ 0⤋
The same thing that determines a second for the rest of the world...an atomic clock in Greenwich England, powered by a cesium atom.
2006-09-10 23:37:52 · answer #2 · answered by Anonymous · 0⤊ 0⤋
National Bureau of Standards
2006-09-10 23:40:06 · answer #3 · answered by wizard8100@sbcglobal.net 5 · 0⤊ 0⤋
A certain large number of energy level transitions of a cesium (Cs) atom. Defined by NIST,etc. Implemented in atomic clocks which use the transistions as their time base.
2006-09-10 23:47:21 · answer #4 · answered by Ren Hoek 5 · 0⤊ 0⤋
its not really a who or what really there is an atomic clock in washington and there is some nuclear atom that vibrates a certain number of times per second and they measure these vibrations to keep an exact measure of the time.
2006-09-10 23:44:32 · answer #5 · answered by JON B 2 · 0⤊ 0⤋
NIST-National Institute of Standards and Technology
http://tf.nist.gov/timefreq/index.html
2006-09-10 23:38:21 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The U.S. Naval Observatory (USNO) is charged with the responsibility for precise time determination and management of time dissemination .
2006-09-10 23:37:28 · answer #7 · answered by Anonymous · 0⤊ 0⤋
You go to your teacher and say "Wait... (look at watch)... there's a second"
Then say "You're such a retarded teacher... I learned what a second was back in 2nd grade!" Haha!
Just don't be wondering why you get kicked out of school if you do that though.
2006-09-10 23:35:37 · answer #8 · answered by Anonymous · 0⤊ 1⤋
someplace near denver, colorado, tells everybody what time it is, they have a very accurate machine that all the atomic clocks get their signals from.
2006-09-10 23:36:10 · answer #9 · answered by Big hands Big feet 7 · 0⤊ 0⤋
http://en.wikipedia.org/wiki/Second
The second (symbol: s; abbreviation: sec.) is the name of a unit of time, and today refers to the International System of Units (SI) base unit of time.
The duration of a beat or half period (one swing, not back and forth) of a pendulum one metre in length is approximately one second
2006-09-10 23:35:36 · answer #10 · answered by rita_alabama 6 · 1⤊ 1⤋