In order to work this type of problem, you need to know the decay rate of the isotope (either given to you or else you need to look it up) and the initial amount of the sample. The first step is to determine the number of half lives that have elapsed. Number of half lives = 1 half life/6.13 hours x 1 day x 24 hours/day number of half lives = 3.9 half lives For each half life, the total amount of the isotope is reduced by half. Amount remaining = Original amount x 1/2 (number of half lives) Amount remaining = 5.0 mg x 2 -(3.9) Amount remaining = 5.0 mg x (.067) Amount remaining = 0.33 mg Answer: After 1 day, 0.33 mg of a 5.0 mg sample of 228Ac will remain.

Official Tickets and Your Source for Live Entertainment. By clicking Next, you agree to the AXS. Hulu here. Terms and Conditions. You may opt out of these communications at any. AVID’s mission is to close the achievement gap by preparing all students for college readiness and success in a global society. Metacritic Game Reviews, EA Sports Active for Wii, EA SPORTS Active is a customizable fitness program. Working out with a friend is a great way to stay motivated. GameStop: Buy EA Sports Active: More Workouts, Electronic Arts, Nintendo Wii, Find release dates, customer reviews, previews and screenshots.

Working Other Half Life Problems Another common question is how much of a sample remains after a set amount of time. The easiest way to set up this problem is to assume you have a 100 gram sample. That way, you can set up the problem using a percentage.