Are there some data ( from measurements ) concerning the effect of magnetic field to the mean lifetime of a neutron ?-- talk ) 21 : 37, 18 March 2013 ( UTC)
22.
The above relations also allow expressing the mean lifetime " ? " of an unstable particle ( in seconds ) in terms of its decay width " ? " ( in eV ) via.
23.
Frame of reference, it exists, on the average, for a standard amount of time known as its mean lifetime, and the distance it travels in that time is zero, because its velocity is zero.
24.
In response, the mean lifetime parturition date of this species has advanced by 18 days . Food abundance showed a significant effect on the breeding date with individual females, indicating a high amount of phenotypic plasticity in this trait.
25.
Thorium-234 has a mean lifetime of 3 seconds, so there is equilibrium if one mole of 238 U contains 9 atoms of thorium-234, which is 1.5 mole ( the ratio of the two half-lives ).
26.
Each atom " lives " for a finite amount of time before it decays, and it may be shown that this mean lifetime is the arithmetic mean of all the atoms'lifetimes, and that it is, which again is related to the decay constant as follows:
27.
Where is the exponential function, time for readings " t " " n " is expressed in seconds, and is the period of time in minutes over which the reading is said to be averaged ( the mean lifetime of each reading in the average ).
28.
In radioactive decay the time constant is called the decay constant ( "'? "'), and it represents both the mean lifetime of a decaying system ( such as an atom ) before it decays, or the time it takes for all but 36.8 % of the atoms to decay.
29.
The mean lifetime of 238 U is 1.41 seconds divided by 0.693 ( or multiplied by 1.443 ), i . e . ca . 2 seconds, so 1 mole of 238 U emits 3 alpha particles per second, producing the same number of thorium-234 ( Th-234 ) atoms.
30.
A top quark, however, has a mean lifetime of 5?0 " 25 seconds, which is shorter than the time scale at which the strong force of QCD acts, so a top quark decays before it can hadronize, allowing physicists to observe a " bare quark . " Thus, they have not been observed as components of any observed hadron, while all other quarks have been observed only as components of hadrons.
