Question

URGENT!!!

The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 115 grams of a radioactive isotope, how much will be left after 6 half-lives? Use the calculator provided and round your answer to the nearest gram.

Answer 1

You can do this without the calculator

115 grams

after 1 half-life = 115 / 2 = 57.5 grams

after 2 half-lives = 28.75 grams

after 3 half-lives = 14.375 grams

after 4 half-lives = 7.1875 grams

after 5 half-lives = 3.59375 grams

after 6 half-lives = 1.796875 grams

Explanation: