Radioactivity of c-14 is used for dating of ancient artifacts. archeologist determined that 20% of initial amount of c-14 has remained. estimate the age of this artifact.

13282.3 years

Explanation:

The C-14 decays exponentially:

The solution for this equation is  

Where:  

No = atom number of C-14 in t=0

N = atom number of C-14 now  

I= radioactive decay constant  

clearing t this equation we get:  

The term 1/I is called half-life and the value for C-14 is 8252 years.  

N for this exercise is 0.2No  

t = 13282.3 years

import math

x=int(input("enter a number: "))

print (math.sqrt(math.fabs(