the-initial-decay-rate-of-a-sample-of-ac-224-is-2-5x105-s-if-the-half-life-of-ac

Question

The initial decay rate of a sample of Ac-224 is 2.50×$$10^{5}/s. If $$the half-life of Ac-224 is 2.78 hours, calculate the time it will take for the decay rate to fall to 1.50×$$10^{3}/s. $$

Accepted Answer

20.5 hours

Answer

14.2 hours

Answer

18.7 hours

Answer

5.11 hours

The initial decay rate of a sample of Ac-224 is 2.50×105/s. If the half-life of Ac-224 is 2.78 hours, calculate the time it will take for the decay rate to fall to 1.50×103/s.

The initial decay rate of a sample of Ac-224 is 2.50×10⁵/s. If the half-life of Ac-224 is 2.78 hours, calculate the time it will take for the decay rate to fall to 1.50×10³/s.