2006-06-26 13:52:22 · 11 answers · asked by some guy 1 in Science & Mathematics ➔ Physics
The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. This definition refers to a caesium atom at rest at a temperature of 0 K.
2006-06-26 13:56:52 · answer #1 · answered by rt11guru 6 · 0⤊ 0⤋
If you were to look at the answers based on the atomic clock, then you would think there would be no definition for a second before these atomic clocks were invented or the radiation from Cesium atoms was discovered.
The actual definition of a second is 1/(24*60*60) part of a day. A day is the time it takes for the earth to complete one revolution on its axis. Before the more precise atomic measurement, astronomical observatories were used to measure the exact length of a day to establish the value of the second.
2006-06-27 03:57:02 · answer #2 · answered by gp4rts 7 · 0⤊ 0⤋
This the standard definition:
One second is the duration of 9192631770 periods of radiation corresponding to unperturbed transistion between the two hyperfine levels (F=4,M=0 and F=3,M=0) of the ground state of Cs-133 atom.
2006-06-26 21:00:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.
2006-06-26 20:57:27 · answer #4 · answered by KansasSpice 4 · 0⤊ 0⤋
The second (symbol s) is a unit for time, and one of seven SI base units. It is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom at zero kelvins.
2006-06-27 08:19:20 · answer #5 · answered by Anonymous · 0⤊ 0⤋
In laymens terms it is 1/60 of a minutes. Although I have read somewhere that one second has been calculate to the number of wavelengths a special laser has given off.
2006-06-26 21:01:41 · answer #6 · answered by Mr Hex Vision 7 · 0⤊ 0⤋
100 jiffies 1/60th of a minute 1/3600th of an hour (a jiffy is an actual unit of time it's not slang. It is 1/100th of an hour.)
2006-07-03 17:11:59 · answer #7 · answered by Anonymous · 0⤊ 0⤋
1/60 of a minute?
2006-06-26 20:55:36 · answer #8 · answered by Chreap 5 · 0⤊ 0⤋
How long it took me to answer this question
~SP
2006-06-26 20:56:45 · answer #9 · answered by Obama! twist™ 4 · 0⤊ 0⤋
one sixtieth of a minute
2006-06-26 20:55:48 · answer #10 · answered by greenfrogs 7 · 0⤊ 0⤋