Answer:
50 atoms have decayed during that time
Explanation:
The radioactive decay is represented as
[tex]N = N_0 * \frac{1}{2}^X\\[/tex]
Where N is the amount of radioactive element after a certain time period
N0 is the amount of radioactive element during the initial time period
X is the half life of the radioactive element
Substituting the given values in above equation, we get:
[tex]N = 100 * \frac{1}{2}^1\\N = 50[/tex]atoms
So, 50 atoms of carbon-14 remain are left after decaying for 5700 years.
Hence, atoms of carbon-14 that decay during 5700 years are 100-50 - 50
