Give the formula for finding half life?

Question

Question is in relation to radioactivity.

Answer 1

what do you mean by half life?
*regarding life .......so far no one has developed any theory for it.,but it wpuld be helpful if you know some parameters to find it 1.behaviour of wife/husband 2.money status# 3.type of children produced 4.eating habits 6.exercises 7................etc

*regaRDING NUCLEAR PHYSICS.........ITS T1/2 = 0.693 / $
WHERE $=decay constant,T1/2 = half life period of the radio active elment

Answer 2

If the initial radioactivity is x, the decay constant is k and t is the time to 1/2 life,

x k^t = 1/2x
k^t = 1/2
t logk = log 1/2
t = - 0.301/logk

Answer 3

half life is given by:
t1\2=0.693/k
k:Decay Constant
it is given by:
k=1/t ln(N/Nt)
N and Nt are initial and final concenterations of the radioactive substance

Answer 4

The half-life of a radio active element subject to exponential decay is the time required for the amount of material to decay to half of its initial value. Here's a decent site on it ....


http://en.wikipedia.org/wiki/Half_lif

Answer 5

see:
http://en.wikipedia.org/wiki/Halflife

The simplest equation is N = Nstart * 2^(-t/tau), where tau is the halflife. The exponential form hides a ln(2) in the decay constant

Answer 6

k=ln.5/half-life