I think that the answer is four because it makes much more sense but five is not greater than five or less than five so I don’t know. Try four though sorry if it’s wrong though.
2/3% converted to a fraction is 1/150
:)))
Answer:
15549 yrs old
Step-by-step explanation:
To find the decay constant r we use the formula
t1/2 = 0.693/r
t1/2 is the half-life 5700
5700 = 0.693/r
r = 0.693/5700 = 0.000122 per sec
For the 15% remaining from an initial value of 100%, time t is calculated from
N = Noe^(-rt)
0.15 = 1e^(-0.000122t)
we take natural log of both sides
Ln 0.15 = Ln e^(-0.000122t)
-1.897 = -0.000122t
t = -1.897/-0.000122 = 15549.18 yrs
Approximately 15549 yrs old
