The mean life (time constant) of radon-222 is 5.526 d. If a sample of radon initially contains 6.00 × 10⁸ radon atoms, how many of them are left after 10.0 d?

Question

Quizplus · Accepted Answer

The number of atoms remaining after time t can be calculated using the formula N = N0 * e^(-t/τ), where τ is the mean life. Substituting the given values, N = 6.00 × 10^8 * e^(-10/5.526), which results in approximately 9.82 × 10^7 atoms remaining.

The Mean Life (Time Constant) of Radon-222 Is 5