College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 34

Tritium has a half-life of 12.33 years. What fraction of the nuclei in a tritium sample will remain (a) after 5.00 yr (b) After 10.0 yr (c) After 123.3 yr (d) According to Equation 29.4a, an infinite amount of time is required for the entire sample to decay. Discuss whether that is realistic.