Which method is commonly used by scientists to determine the age of organic fossils?

Scientists measure the remaining amount of Carbon-14 in a fossil and compare it to the expected amount in a living organism to estimate the time since the organism's death.

The decay of Carbon-14 is a first-order reaction, and the age of the fossil can be calculated using the formula: \( t = \frac{\ln(\frac{N_0}{N})}{k} \), where \( N_0 \) is the initial quantity of C-14, \( N \) is the remaining quantity, and \( k \) is the decay constant.