the general form of the equation which describes exponential decay is:
is the amount at the time t
is the initial amount
k isa constant factor which spcify the speed of decaying(?)
You know that there are left only 0.4985 ml after the first second. This allows us to calculate the constant k:
Therefore the equation of the function is:
As you may have noticed . You can only use this property for small values of k.