Question

Scientists found an animal skull during an excavation and tested the amount of carbon-14 left in it. They found that 55 percent of the carbon-14 in the skull remained. How many years ago was the animal buried? Round your answer to nearest whole number. (Hint: A = A0e-0.000124t.)

A.
443,548 years
B.
362,903 years
C.
6,439 years
D.
4,821 years
help pls

Answer 1

D. 4821 years

Explanation:

A = A0e-0.000124t

A/A0 = e^-0.000124t

0.55 = e^-0.000124t

ln(0.55) = ln(e^-0.000124t)

ln(0.55) = -0.000124t × lne

t = ln(0.55)/-0.000124

4821.266135