Where \ bigl ( \ quad \ bigr ) _ 0 represents the initial isotopic ratio when the system resets, t represents the time after the system reset, and ? 238, ? 235 and ? 232 are the decay constants of 238 U, 235 U and 232 Th respectively.
42.
The name " Half-Life " was chosen because it was evocative of the theme, not clich�d, and had a corresponding visual symbol : the Greek letter ? ( lower-case lambda ), which represents the " decay constant " in the half-life equation.
43.
How long would it take for the pressures in both tanks to equalize ( or what would the decay constant be ) where one tank would be within 95 % ( or perhaps 99.7 % ) of the pressure of the other ? talk ) 01 : 25, 27 August 2015 ( UTC)
44.
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.
45.
Where ? A and ? B are the decay constants of radionuclide A and B, related to their half-lives t 1 / 2 by \ lambda = \ ln ( 2 ) / t _ { 1 / 2 }, and N A and N B are the number of atoms of A and B at a given time.
46.
:Also, the energy scale of the strong interactions as given for instance in terms of the pion decay constant f _ { \ pi } \ approx 93 MeV is much bigger than the up and down quark masses and roughly the same order of magnitude of the strange quark mass, but much smaller than any of the other quark masses.
47.
Where A _ t is the raw, ( uncorrected ) count at time t, A _ 0 is the count at time 0 ( the decay corrected counts ), " e " is the " inverse natural log " function, " k " is the decay constant ( or " lambda " ), and " t " is the elapsed time.
48.
Where C is the solute concentration, \ lambda is the first-order decay constant, Q _ c is the external source or sink term, \ Omega is the internal solute transfer between domains, R is the retardation factor, \ textbf { D } is the diffusion coefficient, and par designates parent species for the case of a decay chain.
49.
Where n 12 = ( n 1 / n 2 ), n 1 is the refractive index of the first medium, n 2 is the refractive index of the second medium, k is the magnitude of the incident wave vector, and ? i is the angle of incidence . The decay constant is used in determining the transmittance of photons from the surface to the probe tip, however the degree of coupling is also highly dependent on the properties of the probe tip such as the length of the probe tip region in contact with the evanescent field, the probe tip geometry, and the size of the aperture ( in apertured probes ).
