Question

Help please

If you have 100 grams of a radioactive isotope with a half-life of 10 years:
Part A How much of the isotope will you have left after 10 years?
Part B. How much of the isotope will you have left after 20 years?
Part C. How many half-lives will occur in 40 years?
fill in the chart

Answer 1

• Time >> Amount
• 0 100 g
• 10 100 g / 2 = 50 g
• 20 50 g / 2 = 25 g
• 30 25 g / 2 = 12.5 g
• 40 12.5 g / 2 = 6.25 g